Pull Search Terms Report weekly. Look for queries that spend but dont convert. Add these as negatives before the next cycle.
Match type matters
Use negative exact for common words (e.g., [free], [discount]) and negative phrase for modifier phrases (e.g., "free trial"). Negative broad is dangerous, it can block good terms.
Shared negative lists
Create shared negative lists organized by: "Free seekers", "Jobs/career", "Competitor names", "Informational". Apply across all campaigns. Related: cro.
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Negative keywords are an under-used profit lever — they redirect budget toward queries that convert.
Start with universal negatives that rarely convert, then build from search-terms data.
Maintain negatives as an ongoing system, not a one-time cleanup.
Use account and campaign-level negatives for both universal exclusions and intent separation.
An under-used profit lever
Negative keywords are among the most under-used profit levers in Google Ads. They feel like cleanup, but every irrelevant search you exclude is budget redirected toward queries that can actually convert. In broad and phrase match especially, accounts leak money on tangential searches constantly, and a strong negative list plugs that leak directly — making it one of the highest-return activities available, not mere housekeeping.
The return is immediate and compounding: money not wasted on junk traffic becomes money available for qualified clicks, and a cleaner query mix helps the platform optimize too. Treating negatives as a core lever rather than an afterthought is a hallmark of a well-run account.
Start universal, then mine your data
Building a strong negative list starts with the obvious universal negatives — generic terms that rarely convert for most advertisers, like free, cheap, or other low-intent modifiers — added across campaigns to stop the most predictable waste. These give you an immediate baseline of protection against searches that almost never produce value.
From there, the real list comes from your own search-terms report. Regularly reviewing the actual queries triggering your ads reveals the specific irrelevant searches wasting your budget, which you add as negatives. This data-driven layer is where most of the value lies, because it targets the waste unique to your account rather than generic assumptions.
Maintain it as a system
The biggest mistake is treating negatives as a one-time purge. New irrelevant queries appear continuously, so negatives need ongoing maintenance — regular search-terms reviews for your top-spending campaigns, with new negatives added as fresh waste surfaces. Without this cadence, waste creeps back in and slowly erodes performance; with it, the account stays lean over time.
Use the two levels deliberately: account-level shared lists for universal exclusions that apply everywhere, and campaign-level negatives for intent separation — keeping each campaign matched to its intended queries and preventing campaigns from poaching each other's searches. Together, universal baseline negatives, data-driven additions from your search terms, and ongoing maintenance turn negative keywords from neglected cleanup into a genuine, compounding profit lever.
Common mistakes that quietly kill results
These come straight from audits we run every week. If any of them stings, you’re in good company — and the fix is usually faster than you think.
Broad-matching your way to wasted spend. On Google, one unreviewed broad-match keyword can quietly burn 20-30% of budget on garbage queries. Review search terms weekly for the first month of any new campaign, then bi-weekly.
Judging ads on ROAS alone. Platform ROAS over-credits retargeting and under-credits prospecting. Watch new-customer CAC and contribution margin, or you'll keep feeding the campaign that's just harvesting people who'd buy anyway.
Scaling budget before scaling creative. Doubling spend on three tired ads just doubles your fatigue rate. The accounts that scale cleanly ship 15-30 new concepts a month and let losers die in 3 days.
Copy that describes instead of sells. 'Premium quality materials' converts nobody. Lead with the outcome, the offer, or the objection. The best hooks come from your reviews, not your brand book.
From the trenches
A client's Google account had 1,400 keywords. We cut it to 220, consolidated 30 ad groups into 8, and watched Quality Scores climb. Same budget, 41% more conversions in two months.
Quick checklist before you ship
Purchasers excluded from prospecting audiences
Tracking verified: a test conversion fired and matched in-platform
One clear change per campaign this week, logged with a date
Landing page loads under 2.5s on a real phone
Budget split sanity-checked: 60-80% prospecting for growth accounts
Search terms / placements reviewed in the last 7 days
At least 3 new creative concepts in testing right now
Frequently asked questions
Why are negative keywords important?
They redirect budget away from irrelevant searches that never convert toward queries that do, making them one of the highest-ROI levers in Google Ads — not mere cleanup.
How do I build a negative keyword list?
Start with universal negatives that rarely convert, then mine your search-terms report for the specific irrelevant queries wasting your budget. The data-driven layer is where most value lies.
How often should I update negative keywords?
Regularly — review the search-terms report for top-spending campaigns on a consistent cadence and add negatives as new waste appears. Negatives are an ongoing system, not a one-time purge.
Try Before You Hire
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Senior Growth Strategist at GrowwithBA. 12 years running SEO, paid media, and retention for ecommerce and SaaS brands from $1M to $100M+. Every guide here comes from live client work — not theory.
Marketing operators, founders, and in-house teams looking for tactical guidance, not generic high-level advice. Particularly useful if you have hands-on responsibility for execution.
What's the source of these recommendations?
Real client engagements at GrowwithBA, a specialists who do the work marketing agency with offices in Nagpur, India and Dover, Delaware, USA. Founded in 2014.
When was this last updated?
2026. The web is full of outdated marketing advice; we update guides as platforms and best practices change.
Is this AI-generated content?
No. Written by senior marketing operators based on actual client work. Reviewed and updated regularly. Real outcomes, real tradeoffs, real costs, not generic templated content.
How can I get help implementing this?
Book a free 30-minute audit with our team. We'll review your current setup and give you a prioritized action list, no sales pitch, no obligation.