You’re paying for clicks. The phone isn’t ringing enough. The leads that do come through include people asking for free advice, job seekers, students, and searchers outside your service area.
That’s the problem negative keywords solve.
If you’ve searched “what is negative keywords in google ads”, the simple answer is this: negative keywords tell Google which searches you don’t want your ads to show for. They’re one of the most practical levers in Google Ads because they cut waste before it turns into more wasted spend.
For Adelaide businesses, this matters fast. A plumber doesn’t want to pay for “plumber jobs Adelaide”. A conveyancer doesn’t want clicks from “conveyancing course”. A beauty e-commerce brand doesn’t want someone looking for “free samples” if that buyer was never going to purchase.
Table of Contents
- Your Ads Are Showing to the Wrong People
- Why Negative Keywords Are a Powerful Targeting Tool
- The Three Negative Keyword Match Types Explained
- Finding Negative Keywords in Your Search Terms Report
- Strategic Negative Keyword Examples for AU Businesses
- Common Mistakes That Silently Drain Your Ad Budget
- How to Add and Manage Negative Keywords in Google Ads
Your Ads Are Showing to the Wrong People
A lot of small business owners discover this the same way. They open Google Ads, see clicks coming in, and assume the campaign is getting traction. Then they check the actual search queries and realise part of the budget went to terms they’d never want to pay for.
A local Adelaide plumber is a good example. The ad might be showing for “DIY plumbing”, “free plumbing advice”, “plumber apprenticeship”, or “plumber jobs Adelaide”. None of those searches are from someone ready to book a paid service. They’re the wrong audience, but Google can still match your ads to them if you don’t tell it otherwise.
That’s where negative keywords become a control tool, not a technical extra.
Instead of thinking about them as admin work, think of them as a filter between your budget and low-value traffic. They stop your ads appearing for searches that don’t fit your offer, your location, or your commercial intent.
What negative keywords actually do in practice
They help you block traffic like:
- Job seekers: people searching for roles, apprenticeships, salaries, and training
- DIY researchers: people looking for instructions, fixes, ideas, or free advice
- Wrong geography: searchers in suburbs, cities, or regions you don’t service
- Low-buying intent: people adding words like free, cheap, review, comparison, or template when that doesn’t fit your offer
If your campaign is bringing in traffic but not proper leads, the first place to look is almost always the Search Terms Report.
For business owners trying to get tighter control over spend, a broader resource on optimizing your Google Ads platform strategy is useful because negative keywords work best when they sit inside a disciplined campaign structure, not as a one-off patch.
Why Negative Keywords Are a Powerful Targeting Tool
Negative keywords matter because they improve three things that business owners care about. Spend efficiency, lead quality, and account health.
In Australian accounts, up to 20-30% of clicks in initial campaign phases can come from non-converting terms according to analysis cited by Optmyzr’s negative keywords guide. That’s not a minor clean-up issue. That’s a chunk of budget going to the wrong searches.
The same source cites a 2024 Adelaide plumber case study where adding 150 account-level negative keywords reduced wasted ad spend by 28% over three months, while cost per lead dropped from AUD 45 to AUD 32.
It saves money by stopping bad clicks before they happen
Most wasted spend doesn’t come from one disastrous keyword. It comes from lots of small leaks.
A click from “free plumbing advice” might not look dramatic on its own. But if the account keeps matching to low-intent searches every day, that drain adds up. Negative keywords stop the leak at the query level.
It improves lead quality
Better targeting means the people who do click are closer to buying.
For trades, that often means excluding “job”, “salary”, “apprenticeship”, and “DIY”. For professional services, it might be “template”, “course”, or “free legal advice”. For e-commerce, it could be “used”, “free”, or overseas shipping terms that don’t fit the store’s delivery footprint.
When click quality rises, conversion quality usually follows. That’s also why teams focused on relevance often work on ad copy and query control at the same time. If you want another angle on that, this guide on how to improve Click Through Rate is useful because CTR improves when the wrong traffic stops seeing your ad in the first place.
It supports stronger account health
Google rewards relevance. If your ads keep showing to people who never click or never convert, the account gets noisier and harder to optimise.
Negative keywords help clean that up. You’re removing poor-fit queries so your ads, landing pages, and targeting line up more tightly. If you want the deeper mechanics behind that, this explanation of what Quality Score means in Google Ads is worth reading.
Practical rule: If a search term clearly doesn’t fit your service, your location, or your buyer intent, don’t leave it in the account hoping Google will sort it out later.
The Three Negative Keyword Match Types Explained
Negative keywords aren’t just a list of blocked words. The match type decides how tightly Google applies that block.
The three types are negative broad match, negative phrase match, and negative exact match. According to Socius Marketing’s explanation of negative keyword behaviour, negative exact match blocks only the precise query, negative phrase match blocks queries containing that phrase in the same order, and negative broad match blocks queries containing all terms in any order. The same source notes an important detail many advertisers miss: negative keywords do not trigger on close variants, so you often need separate entries for singular and plural forms.
Think of match types like different filters
If you’re running a local service campaign, each match type acts like a different level of strictness.
- Negative broad match is the widest filter. If you add
plumbing courseas a broad negative, Google can block searches that contain both words in any order. - Negative phrase match is more controlled. If you add
"plumbing course", Google blocks searches with that phrase in that order. - Negative exact match is the narrowest option. If you add
[plumbing course], Google blocks only that exact query.
Phrase match negatives are often the most practical starting point for local campaigns because they give control without becoming too narrow.
Negative Keyword Match Type Behaviour
| Match Type | Your Negative Keyword | Will it Block a Search for 'free plumbing course adelaide'? | Will it Block a Search for 'adelaide plumbing course'? |
|---|---|---|---|
| Broad | plumbing course | Yes | Yes |
| Phrase | "plumbing course" | Yes | Yes |
| Exact | [plumbing course] | No | No |
A common mistake is assuming negatives behave like positive keywords. They don’t. If you add one version and assume Google will catch misspellings, plurals, or close variants automatically, you’ll miss a lot of waste.
What works best in most SMB accounts
For most Adelaide service businesses:
- Use phrase match negatives for recurring junk patterns like “jobs”, “DIY”, or “free advice” variations.
- Use exact match negatives when a single query is bad but related searches may still convert.
- Use broad negatives carefully because they can block more than you intended.
Good negative keyword management isn’t about adding the biggest list. It’s about choosing the right level of restriction for each bad query pattern.
Finding Negative Keywords in Your Search Terms Report
The best negative keywords don’t come from guesswork. They come from your Search Terms Report.
That report shows the actual searches people typed before your ad appeared. If you want to know where spend is leaking, you’ll find it there.
For Australian advertisers, this review work isn’t optional. Guidance cited in this YouTube walkthrough on negative keyword mining says that regularly mining the Search Terms Report can lead to a 15-25% recovery of wasted spend. The same source says that for Adelaide trades and professional services, excluding terms like “job” or “course” has been shown to lift click-through rates by 10-20% and conversions by 15% by improving relevance.
What to look for first
Start with the searches that are obviously wrong. Those are the quick wins.
Look for terms tied to:
- Employment intent: jobs, career, apprenticeship, salary
- Learning intent: course, training, certificate, how to
- Freebie intent: free, sample, template, advice
- Wrong location: suburbs, cities, or states you don’t service
- Research-only language: reviews, comparison, vs, meaning
After that, look at the commercial signals.
A search term becomes a negative candidate when it spends money without behaving like a buying query. Zero-conversion terms, poor CTR, or queries that are clearly outside your offer are the first ones to review.
A simple review routine
Use this sequence inside Google Ads:
- Open the campaign or ad group
- Go to Keywords
- Open the Search Terms Report
- Sort by spend or clicks
- Mark irrelevant terms
- Choose the right match type
- Add at ad group, campaign, or list level
The video below gives a practical visual walkthrough of the process.
How to think like an analyst instead of a list builder
Don’t ask, “What words can I block?”
Ask, “What search intent is wasting money?”
That shift matters. If you only block one exact query at a time, you’ll spend months cleaning symptoms. If you spot the pattern, such as all course-related or salary-related searches, you can clean the account far faster and with more control.
Review actual search intent, not just the keyword string. Two queries can look similar on paper and still have completely different buying intent.
Strategic Negative Keyword Examples for AU Businesses
A good negative keyword strategy changes by business model. The list for a local plumber shouldn’t look like the list for a skincare store or a conveyancer.
Trades and local services
A trades campaign usually loses money on informational and employment traffic.
Before:
Your ad shows for “blocked drain fix yourself”, “plumber jobs Adelaide”, “plumbing apprenticeship near me”, “free plumbing advice”.
After:
You add negatives around DIY, jobs, apprenticeship, free, and irrelevant suburbs or cities outside your service area.
Starter themes for trades:
- DIY intent: diy, how to, fix yourself, tutorial
- Employment searches: jobs, salary, apprenticeship, trainee
- Research-only traffic: forum, review, reddit
- Wrong geography: city names you don’t serve
If you only service Adelaide metro, queries with interstate city names should be reviewed aggressively.
E-commerce stores
E-commerce waste often comes from buyers who want something different from what you sell.
A beauty brand might get searches for “free samples”, “cheap dupe”, “DIY skincare recipe”, or shipping terms outside Australia. An apparel store might attract “used”, “wholesale”, or “pattern” searches that don’t fit its offer.
Good e-commerce negatives often sit around:
- Free seekers: free, sample, giveaway
- DIY behaviour: recipe, make, tutorial
- Product mismatch: used, wholesale, manual
- Shipping mismatch: overseas locations you don’t fulfil
The goal isn’t to block all top-funnel traffic. It’s to stop paying for searchers who were never realistic customers.
Professional services
Professional services accounts need to protect against education and information intent.
A conveyancing firm can waste spend on “conveyancing course”, “conveyancer salary”, “free legal advice”, or “what does a conveyancer do”. A finance business may see similar drift into careers, training, calculators, and definitions.
Useful starter themes include:
- Career intent: jobs, salary, graduate, internship
- Learning intent: course, training, degree
- Free intent: free advice, template, sample
- Low-fit locations: cities and states outside the service footprint
The best negative keyword list is built around business fit. If the searcher’s likely next step isn’t to contact you or buy from you, that query needs scrutiny.
Common Mistakes That Silently Drain Your Ad Budget
Most advertisers know they should add negative keywords. The bigger problem is adding them badly.
Some accounts waste money because they barely use negatives. Others hurt themselves by applying the wrong match type, blocking useful traffic, or treating the list as set-and-forget admin.
When the wrong match type causes the problem
This happens all the time.
An advertiser sees one bad query and adds a broad negative too quickly. That broad exclusion ends up blocking useful searches that include the same words in a different, more commercial context. The reverse also happens. They add only exact match negatives and leave dozens of wasteful variations untouched.
Other common mistakes include:
- Only reacting to one query at a time: that creates bloated lists without fixing the wider pattern
- Applying campaign-wide negatives too early: some terms are bad for one ad group and useful in another
- Never revisiting older lists: business offers change, service areas change, and search behaviour changes too
A proper review should connect exclusions to lead quality and cost, not just personal hunches. If you need a cleaner way to evaluate whether a query is too expensive, this guide on how to compute conversion costs helps frame the decision around economics instead of guesswork.
When too many negatives hurt performance
This is the mistake most basic guides ignore.
According to a 2025 SEMrush AU study cited in this discussion of over-reliance on negative keywords, 62% of local service SMBs using aggressive negative lists saw a 15% drop in impression share. In plain terms, they blocked enough traffic that Google had less room to find converting searches.
That matters most in lower-volume campaigns using Smart Bidding. If the campaign doesn’t have much conversion data already, over-negativing can choke off learning.
Signs you may be overdoing it:
- Reach is shrinking without a matching lift in lead quality
- Search term volume is thin, so Google has less signal to work with
- New customer acquisition stalls even though search demand still exists
- Lists are full of broad exclusions added early without enough data
This is one reason budget reviews should include both waste and missed opportunity. The team that only asks, “What can we block?” often misses the more important question, “What useful demand are we cutting off?” A deeper read on whether your PPC budget is spent wisely helps put that trade-off in the right context.
Negative keywords should tighten intent, not suffocate reach.
How to Add and Manage Negative Keywords in Google Ads
Once you’ve identified a bad query, adding it is straightforward. The decision is where it belongs.
In November 2025, Google doubled the negative keyword list limit to 10,000 keywords, which gave growing advertisers more room to manage exclusions at scale without relying on clunky workarounds, as reported by Search Engine Land’s coverage of the update.
Where to add them
You’ve got three practical levels to work with:
- Ad group level: best when a term is only irrelevant to one tightly themed ad group
- Campaign level: best when the term is bad across the whole campaign
- Shared negative lists or account-level structure: best for universal junk like jobs, salary, free, or irrelevant regions
If you run multiple campaigns, shared lists keep things consistent and save time.
A workable maintenance process
Keep the workflow simple:
- Check the Search Terms Report weekly
- Add obvious waste promptly
- Review match type before applying
- Group recurring negatives into themed lists
- Audit larger lists quarterly
Good list names make management easier. “Jobs and Careers”, “DIY and Research”, and “Out of Area” are clearer than random mixed lists.
If you’re also tightening campaign structure more broadly, these practices for optimising Google Ads campaigns pair well with negative keyword management because exclusions work best when the account is already organised around clear intent.
If your Google Ads budget is leaking into irrelevant clicks, Frank Digital Agency can help tighten your campaigns, improve lead quality, and turn more of your spend into real enquiries.