A negative keyword is the filter that keeps your ad from showing up for irrelevant searches. It is the cheapest efficiency lever in Google Ads: it requires no new creative, no extra budget, and usually returns 10% to 30% of wasted spend in the first month alone.
What a negative keyword is
It is a term you declare so Google won't show your ad when it appears in a search. If you sell paid consulting and someone searches "free course," negating "free" prevents the click that would never become a customer.
| Match type | Blocks | When to use it |
|---|---|---|
| Broad negative | searches containing all the terms, in any order | general account cleanup |
| Phrase negative | searches with the exact phrase in order | blocking specific intents |
| Exact negative | only the identical search | fine-tuning ambiguous terms |
Essential base lists every account should have
- Free intent: free, gratis, download, torrent, pdf.
- Job-seeking intent: job opening, salary, internship, exam, resume, how to become.
- Educational intent: course, workbook, class, tutorial, college, example of.
- Complaint intent: is it a scam, reviews site, lawsuit, complaint.
- Direct competitors: brands you don't want to fight over an expensive click.
- Irrelevant geography: cities and states outside your service area.
The search term mining routine
Frequency
New accounts: twice a week in the first month. Mature accounts: every 15 days. Broad match campaigns need more frequent review than exact match campaigns.
What to look for in the report
- Terms with clicks and zero conversions at a meaningful volume.
- Terms with a high CTR and zero conversion: misleading attraction.
- Terms that reveal purely informational intent.
- Terms pointing to a product or service you don't offer.
This work is the practical counterpart to the investment discipline described in the guide to paid traffic.
Mistakes that cost money
- Negating terms that are too broad and blocking good searches along with the bad ones.
- Applying the list to the wrong campaign, or forgetting to apply it to new ones.
- A negative conflicting with the campaign's own positive keyword, zeroing out impressions.
- Creating dozens of lists with no naming convention, making maintenance impossible.
- Negating a term before you have enough volume to conclude it's actually bad.
How to organize shared lists
| List | Scope | Application |
|---|---|---|
| Brand, institutional | whole account | every campaign |
| Free intent | whole account | every campaign |
| Out of area | geographic | local campaigns |
| Competitors | strategic | service campaigns |
| Product not offered | by line | specific campaign |
Negative keyword hygiene checklist
- Shared lists created and named with a consistent pattern.
- Search terms report reviewed on a schedule.
- Conflicting negatives checked with the diagnostic tool.
- Variations, plurals, and misspellings included.
- New campaigns inheriting the account's lists.
- Estimated monthly savings documented.
Conclusion
Negating well isn't cutting traffic: it's redirecting budget toward the searches that actually have a chance of becoming a customer. It's the highest-return optimization per hour of work in any Google Ads account.
Frequently asked questions about negative keywords
What are negative keywords?
They are terms that stop your ad from showing up for irrelevant searches. They don't generate traffic, they prevent it, protecting your budget from clicks that would never become a customer.
How often should I review the search terms report?
Weekly for new accounts or ones with a high budget, and every two weeks for stable accounts. Ideally, review it whenever the creative, offer, or budget changes.
Do negative keywords work on display and video campaigns?
They work partially, through topic, channel, and placement exclusions. The most precise use is still on search network campaigns.
Can over-negating hurt the campaign?
Yes. Too many broad negatives restrict the algorithm's learning and cut volume. Prefer exact or phrase negatives for specific terms.
About the author
Kauára Bertoluci
Partner and Head of Strategy & Growth, KCLOCK
Marketing, tracking, and CRO strategist. Leads positioning, funnels, paid media, and measurement across KCLOCK's projects.
- #paid media
- #optimization
- #google ads
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