How to Build Negative Keyword Lists Fast
By Bill Hartzer · Hartzer Consulting
A negative keyword tells Google Ads (or Microsoft Advertising) a search you do not want to trigger your ad. It's the other half of keyword strategy that gets far less attention than the positive keyword list, and in most accounts I've audited, it's also where a meaningful share of wasted spend is hiding in plain sight.
Why negative keywords matter more than they get credit for
Even a tightly built positive keyword list will attract search queries you didn't anticipate, especially on broad and phrase match (see our guide to match types for how those work). A landscaping company bidding on "lawn care" will eventually pay for a click from someone searching "lawn care jobs" or "lawn care salary." Neither searcher is a prospect, and neither click should have cost anything. The fix isn't to abandon broad or phrase match — it's to keep the negative list current enough that the account learns from every wasted click instead of repeating it.
Where wasted spend typically hides
A handful of categories account for most of the negative keywords in almost any account: job-seeker terms ("jobs," "salary," "hiring," "career"), research and education terms ("what is," "how does," "definition," "course"), free/DIY terms when you sell a paid service ("free," "diy," "template"), competitor and brand terms you don't want to bid on deliberately, and geographic terms outside your actual service area. Pulling the Search Terms report periodically and scanning it against these categories will surface most of what needs to be excluded.
Match types apply to negatives too
Negative keywords have their own broad, phrase, and exact match behavior, and it's worth being deliberate about it. A broad negative match is powerful but can accidentally block legitimate traffic if it overlaps with a real product or service term, so it's worth a second read before you upload a long negative list rather than assuming broader is always safer.
Building the list in bulk
The slow way to build a negative list is one keyword at a time, in the Google Ads
interface, after you've already spent money learning you needed it. The faster way is to
generate a large negative list up front: take your positive keyword root terms, combine
them with a list of disqualifying modifiers (job-seeker terms, free/DIY terms, and
anything specific to your industry), and prefix the whole result with a minus sign in a
single pass. That's precisely what the negative-keyword modifier on the
Word & Keyword List Combiner and
Three-List Combiner is for: check the box, and
every combination in the result is generated with a leading - instead of
needing to be edited by hand afterward.
A practical starting list
If you're starting a negative list from nothing, a reasonable seed list of modifiers to combine with your own root terms includes: jobs, salary, hiring, career, free, diy, template, definition, what is, how to, course, and reviews (if you don't want review-site traffic). Combine that list with your product or service terms, generate the negative version, and refine it every time you review search terms rather than treating it as a one-time setup task.