Negative keywords are one of the first things anyone learns about Google Ads. Block the searches you don't want. Add negatives. Keep your traffic clean. The logic is simple and correct as far as it goes. The problem is that most accounts treat the negative keyword list as a fire-and-forget task done at setup, and the way match types work in 2026 means that list does less protective work than it used to.
This isn’t a knock on negative keywords. They’re necessary. An account without them is spending money on searches that will never convert, and the evidence is sitting right there in the search terms report waiting for someone to look. But a robust negative keyword list is not the same as good targeting. It’s a filter layered on top of targeting, and if the targeting underneath is loose, the filter is working harder than it should and still letting things through.
Understanding what negatives actually do, and don’t do, changes how you manage campaigns, and it changes what you ask your agency to show you.
How Negative Keywords Work (And How They’ve Changed)
A negative keyword tells Google not to show your ad when a search query contains that term. Add “free” as a negative broad match and your ads won’t show when someone searches “free dentist near me” or “free teeth cleaning.” Add “jobs” as a negative and you won’t show for “dentist jobs Austin.” The mechanics are the same as positive keywords, just inverted.
The match type logic applies to negatives too, but it works differently than most people expect. Negative exact match only blocks searches that contain that exact phrase. Negative phrase match blocks searches that contain that phrase in that order. Negative broad match blocks searches that contain all the words in any order.
For most negative use cases, negative broad match is what you want. “Jobs,” “careers,” “apply”, you want to block any search containing those words. For competitive brand exclusions, negative exact match or phrase is appropriate because you only want to block specific searches, not all queries that mention a brand in passing.
Here’s where it gets relevant: Google’s broad match for positive keywords now matches to related concepts, synonyms, and inferred intent, not just literal keyword text. But negative keywords don’t get that same semantic expansion. A negative for “cheap” does not block “affordable” or “budget-friendly” or “low-cost.” According to Google’s negative keyword documentation, negative keywords use traditional text matching, not the same semantic interpretation applied to positive keywords.
Your positive keywords are casting a wide net. Your negative keywords are cutting out specific strings of text. The net is bigger than the scissors.
The Three Categories of Irrelevant Traffic
When we pull a search terms report on an account that hasn’t been actively managed, the irrelevant spend falls into three pretty consistent buckets.
The obvious mismatches are the ones that seem like they should have been caught. A law firm’s campaign triggering for “law and order SVU.” A plumber showing up for “drain flies.” An accountant appearing for “count calories.” These happen because broad match is interpreting keyword intent liberally, and the negative list wasn’t built to anticipate every adjacent topic. They’re fixable with negatives, but you have to catch them first.
The competitor and research searches are common in industries where people shop around or research heavily before buying. A dental practice targeting “Invisalign” showing for “[Competitor Name] Invisalign reviews.” A software company targeting “project management software” showing for “Monday.com vs Asana.” These require either negative keywords for competitor names or a deliberate decision to compete for those terms (which is a different strategic choice, not an oversight).
The intent mismatches are the hardest to block with negatives alone. Someone searching “how to fix a leaking faucet” when you sell plumbing services. Someone searching “dentist salary” when you’re a dental practice. The search contains your category keywords but the person isn’t looking to hire anyone. These require either a campaign structure that excludes informational intent, or the recognition that your broad match targeting is pulling in researchers alongside buyers.
| Traffic Type | Caused By | Fix |
|---|---|---|
| Obvious mismatches (wrong category) | Broad match semantic expansion | Add negative keywords; tighten match types |
| Competitor brand searches | Broad and phrase matching to brand terms | Negative exact match on competitor names |
| Intent mismatches (research, DIY) | Broad match without intent filtering | Tighter match types or separate campaigns by intent |
| Geographic mismatches | Location targeting set to "presence or interest" | Change to "presence only" in location settings |
| Job seeker traffic | No employment negatives at setup | Add "jobs," "careers," "salary," "hiring," "apply" |
Why Negative Lists Decay
A negative keyword list built at account launch has no way to anticipate the searches your campaigns will generate over the next two years. The searches change as Google expands match type interpretation. They change as your product or service categories evolve. They change as new competitors enter the market and people start searching their names.
The only way to keep the negative list current is to review the search terms report regularly. Once a month at minimum. Every two weeks on accounts with significant spend. The search terms report shows you every actual query that triggered an ad and resulted in a click. It’s not a sample. It’s the full list of what you paid for. Sorting by cost descending and reading through the top 50 or 100 queries once a month takes about 15 minutes and catches most of the problem before it gets expensive.
If your agency isn’t showing you search terms data in their monthly report, ask for it. Not a summary. The actual queries. If they can’t produce a list of the search terms that spent money in the last 30 days, they’re not reviewing the search terms report, which means irrelevant spend has been accumulating since the last time anyone looked.
We cover the search terms report in more depth in our post on where your ad budget actually goes.
"Can you show me the search terms that spent money in the last 30 days?" If they can't produce the actual list quickly, the search terms report isn't being reviewed.
When to Tighten Match Types Instead of Adding Negatives
There’s a management pattern worth recognizing: when an account has 400 negative keywords and is still generating significant irrelevant traffic, the problem is not a negative keyword gap. The problem is that the targeting underneath is so loose that filtering with negatives is trying to hold back a flood. The right answer at that point is to tighten the match types, not add another 200 negatives.
This usually comes up on accounts that were built on broad match keywords because an agency was trying to maximize reach or let Smart Bidding “find opportunities.” Smart Bidding needs conversion data to optimize well, and broad match is a fast way to gather data. It’s also a fast way to spend money on searches that have nothing to do with your business.
If you’re spending more than 20% of your budget on searches that wouldn’t survive a basic relevance check, and you can verify this in the search terms report by calculating irrelevant spend as a percentage of total spend, it’s time to talk about campaign structure, not just negative keywords. Moving core services to phrase or exact match campaigns doesn’t limit volume as much as it used to (because Google’s interpretation of phrase and exact has expanded), but it does reduce the radius of irrelevant reach substantially.
How to Check Your Own Account
Open your search terms report in Google Ads (Campaigns > Insights & Reports > Search terms, or from within any campaign’s keywords tab). Set the date range to the last 90 days. Sort by Cost descending.
Read through the top 100 queries by spend. For each one, ask: is this person likely to be a qualified buyer? If the answer is no, add the distinguishing term to your negative list. If you find yourself adding more than 20–30 negatives from a single review, that’s a sign the underlying targeting needs a harder look.
Also check what percentage of your total spend is going to queries with no conversions at all. Filter the search terms report by “Conversions = 0” and look at how much of your budget went to searches that never produced a result. Some of that is normal, not every search converts. But if it’s more than 40–50% of total spend on zero-conversion queries, you’re feeding the account money that isn’t doing any work.
Our Google Ads management includes a standing search terms review at every monthly check-in. If you want us to pull your search terms data and show you what you’ve been paying for, request a free audit and we’ll walk through it with you.
