In one sentence: Negative keywords are the words and phrases you tell Google Ads to exclude, so that any search containing them never triggers your ads and you stop paying for clicks from people who were never going to hire you.
Keywords are looser than owners expect. Ask Google to show your ad for gutter cleaning and it will cheerfully show it to somebody searching how to clean gutters yourself, or gutter cleaning jobs hiring, or a teenager pricing a summer side hustle. Those clicks cost the same as the homeowner with a clogged downspout in a rainstorm.
A negative keyword list is how you say no. Add words like free, DIY, salary, jobs, training, and how to, and searches carrying them stop reaching your ads. You can block a single word, a phrase, or one exact search, and you can hold one list that applies across the whole account.
Negatives come in the same shapes as keywords, and the shape decides how much they cut. Block a phrase and you exclude searches carrying those words in that order. Block an exact search and you exclude that one search and nothing near it. Block a single common word and every search containing it vanishes from your reach, which is the powerful option and the one owners regret.
As a worked example, with round made-up numbers: say clicks in your trade run $10, and a quarter of the searches triggering your ad are people who intend to do the job themselves. On a $2,000 month that is $500 spent teaching strangers to skip you.
A national brand can absorb junk clicks. A local service business on a modest daily budget cannot. Burn through it on bad clicks in the morning and the ads go quiet in the afternoon, which is often when your actual customers start looking.
The waste has a shape, and it repeats by trade. People looking for work rather than workers. People researching how to do it themselves. Other contractors pricing materials. Shoppers two states outside anywhere you serve. Anyone attaching free, cheap, or wholesale to a job you sell at a professional rate. None of them is going to hire you, and every one of them spends your budget at exactly the same rate a real customer does.
The second cost shows up on the phone. Ads that pull the wrong searches produce the wrong calls, and an owner who spends a week fielding job seekers and homework questions concludes that Google Ads does not work in their trade, when what did not work was the match. The channel gets blamed for a list that was never written.
The fix is unglamorous: read the searches your ads actually matched, week after week, and keep pruning, which is ordinary upkeep in any Google Ads account worth running.
It is possible to overdo this. Block a common word too broadly and you quietly switch off searches that were worth having, then spend a month wondering where the volume went. Competitor names are the usual argument: excluding them keeps you out of comparison searches, which is sometimes exactly right and sometimes hands a ready-to-hire customer to the other guy. Either call is defensible. Making it by accident is not.
Reading those searches has a second payoff worth naming. The ones you decide to keep tell you what customers actually call the work, in their words, and that language is usually plainer and more specific than anything written on your own website.
Not directly. They change which auctions you enter, not the price inside any one of them. The indirect effect is real though: when the searches you do match fit your ad and page, your relevance signals improve, and relevance is part of what sets your price.
No. New phrasings show up constantly, and a list built once and left alone starts leaking within a few months. It wants a regular look, not a one-time setup.
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