Negative keyword

This is the detail that costs accounts money, because the naming implies a symmetry that does not exist.

Positive broad match expands aggressively. It reaches synonyms, related concepts and searches sharing no words with the keyword, using signals from across the account. Negative broad match does none of that. It blocks only searches that contain all of the words in the negative keyword, in any order, and nothing else.

So a negative broad keyword of "cheap" blocks "cheap running shoes" and does not block "budget running shoes", "discount running shoes" or "affordable running shoes". Each of those needs its own negative.

Negative phrase blocks the words in order. Negative exact blocks the exact term. None of the three matches close variants either: excluding "flower" does not block "flowers", so plurals and misspellings need negatives of their own, and the synonym expansion that makes positive broad match so wide has no negative equivalent at all.

The practical consequence: blocking a concept means enumerating the ways people express it, not adding one word and assuming the platform will generalise.

When exact match meant exact and broad match was a checkbox few people used, negatives were housekeeping. They are now structural, because every match type reaches beyond its literal text and broad match draws on account-level signals to decide what counts as relevant.

Automated bidding raises the stakes again. A system optimising toward conversions will happily spend on a category of search that occasionally converts, and negatives are the only way to tell it that a category is off limits regardless of what the data suggests.

This is also why the search terms report matters more than it used to. It is the only place the account tells you what it actually bought, as opposed to what it was configured to buy, and on a broad match campaign those two can differ substantially.

Intent mismatches come first: "free", "cheap", "DIY", "how to", "jobs", "careers", "salary". These attract searches that match the theme and will never buy, and they are the same across most accounts, which makes them a good shared list.

Research and comparison terms are a judgement call rather than an automatic block. "Reviews", "vs", "alternatives" and "best" indicate somebody deciding, which for a considered purchase can be exactly the right moment and for an impulse one is a waste.

Competitor brands need a decision rather than a default. Bidding on them is legal in most markets and produces expensive, poorly converting clicks; not bidding cedes the ground. Either answer is defensible and the client should make it knowingly.

Irrelevant senses of an ambiguous term are the account-specific category, and the only way to find them is the search terms report. A client selling industrial seals will discover a lot about marine mammals.

Negatives added campaign by campaign as somebody notices a bad search term work until there are six campaigns, at which point they have diverged. One campaign blocks "free", two block "free" and "cheap", and nobody can say which.

Shared negative keyword lists solve this: define a list once, apply it to every campaign that needs it, and change it in one place. Most accounts want two or three, typically a global intent list, a competitor list, and anything specific to a product line.

Campaign-level negatives still have a use, and it is a specific one: separating campaigns that would otherwise compete for the same searches, such as keeping generic terms out of a brand campaign.

The review itself should be scheduled rather than triggered by disappointing results. Doing it only when performance dips means the wasted spend has already happened, and it frames routine maintenance as a response to failure.

A negative keyword is a permanent instruction that something will never be bought again, and its effects are invisible afterwards. Nothing in the interface reports the conversions a negative prevented.

So the check happens beforehand: filter the search terms report for the word, over a long enough period, and look at what it would have excluded. A term that reads as obviously irrelevant sometimes turns out to have produced business.

The classic example is a word that looks like price sensitivity and is not. "Cheap" is usually safe to block. "Affordable" and "budget" are frequently used by people with a real budget who simply want to know it is within it.

This is also the check worth showing a client, because it turns a housekeeping task into visible evidence of judgement.