Negative Keyword Maintenance: The Unglamorous Work That Protects Your Search Budget

A law firm running search ads for personal injury cases was showing up on searches like "personal injury lawyer jobs" and "how to become a personal injury lawyer," paying for clicks that did not come from prospective clients. Every one of those clicks came out of the same daily budget that should have been reaching people actually looking to hire a lawyer. Nobody had done anything wrong at launch; the search terms report simply hadn't been reviewed since the campaign went live.

Why broad and phrase match need a counterweight

Broad and phrase match keyword types exist to help paid search campaigns find relevant traffic beyond the exact phrases you bid on, which is valuable because customers don't always search the way you'd predict. But that same flexibility means the platform will occasionally match your ad to a search that's topically adjacent but not a genuine prospect: informational searches, job searches, searches for a free or DIY version of what you sell, or searches for a competitor's brand name that happens to share words with yours. Negative keywords are the mechanism that filters those out without narrowing your match types back down to something too restrictive.

Categories of negative keywords worth building proactively

• Job-seeker terms: "jobs," "careers," "salary," and "hiring" are nearly universal negatives for any service business.
• DIY and free-intent terms like "free," "DIY," and "how to do it yourself" are relevant for businesses selling a service that has a free or self-service alternative.
• Educational/informational terms like "what is," "definition of," and "how does X work" indicate searchers gathering general knowledge rather than being ready to buy.
• Irrelevant adjacent services: for a wine estate, terms like "wine making kit" or "wine course" if the business doesn't offer those.
• Competitor brand terms, if the strategy is not to bid on or appear against them.

Building the list from evidence, not guesswork

A negative keyword list built entirely in advance, from intuition, will always miss things a live search-terms report reveals. The reliable process is a recurring review of the actual queries triggering your ads:

1. Pull the search terms report at the account or campaign level on a recurring cadence: weekly for a new or high-spend campaign and monthly for a stable one.
2. Sort by spend or clicks to prioritize reviewing the terms costing the most first.
3. For each irrelevant term, decide whether to add it as a negative at the ad group, campaign, or account level depending on how broadly it applies.
4. Re-check performance after adding negatives to confirm spend is shifting toward more relevant queries, not just shrinking overall.

Match type matters when adding negatives too

Negative keywords have their own match types, and getting this wrong can silently block traffic you wanted. A negative broad match for the word "free" will block any search containing that word in any order, which might be exactly right; however, a negative exact match for "[wine tour free]" only blocks that specific phrase. Choosing the tightest negative match type that solves the actual problem avoids accidentally excluding good traffic that happens to share a word with bad traffic.

Every irrelevant click a negative keyword blocks is budget returned to a search that could have actually converted.

Shared negative keyword lists across campaigns

Most platforms let you build a shared negative keyword list and apply it across multiple campaigns at once: this is useful for negatives that apply account-wide, like job-seeker terms, so you're not re-adding the same negatives to every new campaign individually. Reserve campaign-specific negative lists for terms that are only irrelevant to that one campaign's specific offer.

How this differs for e-commerce vs. lead generation

Lead-generation businesses (most local service categories) tend to see the most waste from informational and job-seeker searches. E-commerce accounts tend to see more waste from bargain-hunting terms like "cheap" or "used" when the business sells new, full-price product; this is worth building into the negative list from day one if that's a known mismatch with the catalog.

Search-term review and negative keyword maintenance is one of the recurring, less glamorous tasks built into every paid search account we manage; it rarely makes for exciting reporting, but it is often where meaningful budget gets reclaimed. More on how we structure ongoing paid media management on our services page.

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