Negative Keywords

Negative keywords work as a block list layered on top of whatever positive match types you are running, and they can be applied at three levels: the individual campaign, the individual ad group, or a shared list attached to multiple campaigns at once. A shared negative list is the standard way to maintain account-wide blocks - competitor names, "jobs," "free," "DIY," "how to" - without having to paste the same list into every campaign separately and keep them all in sync by hand.

The mechanical detail that trips people up most is that negatives have their own match types (broad, phrase, exact) but, unlike positive keywords, negatives do not expand to close variants. A positive exact-match keyword for "shoes" will still catch the misspelling "shoos" through close variant matching; a negative exact-match keyword for "shoes" will not block a search for "shoos" - you have to list the misspelling itself if you want it blocked. This asymmetry means a negative list built once and never revisited tends to develop gaps as new misspellings and phrasings show up in the search terms report over time.

Negatives interact directly with match type strategy on the positive side: the wider your positive match types (broad, then phrase, then exact), the more negative keyword coverage you need to keep query quality in check, since broad match relies on negatives to do work that phrase and exact match are partly doing for you through their own matching logic. This is why broad match campaigns typically carry the heaviest negative lists in an account and need the most frequent negative-list maintenance. Negatives also interact with Performance Max, which accepts account-level negative keyword lists through a support request rather than the standard campaign settings UI - a workaround worth knowing about since Performance Max otherwise offers very little direct negative keyword control compared to Search campaigns.

The classic and genuinely dangerous mistake is a negative that is broader than intended and quietly overlaps a money keyword, silencing an entire ad group with no visible error message anywhere in the interface - Google will not warn you that a negative is blocking a positive keyword you are actively bidding on. A negative like "free" added at the campaign level can silently kill traffic to an ad group selling a free-trial offer if nobody checks the overlap. The way to catch this is the negative keyword conflict report or a manual audit whenever a campaign's traffic drops unexpectedly with no obvious cause in bid, budget, or approval status.

In reporting, negatives themselves generate no rows in standard performance reports since blocked traffic never occurs - so you cannot see the effect of a negative directly, only infer it from before-and-after comparisons of the search terms report and overall spend efficiency. The practical habit is to add negatives from the search terms report on a recurring cadence (weekly for broad match campaigns, less frequently for tighter match types), and to periodically review the shared negative lists themselves for entries that may have become outdated or too broad as the account's keyword set has grown.