If you have never built a proper negative keywords list, there is a good chance a meaningful slice of your ad budget is being spent on searches that will never buy your product. The fix is not complicated and it does not take long. In the next 20 minutes you can build your first negative keyword blocklist and stop the most obvious leaks in your account — no advanced tools required, just your search-term report and a clear head.

Negative keywords tell Amazon which searches you do not want your ads to show for. They are the single most direct way to cut wasted spend, because unlike bid changes, adding a negative never risks your winners — it only blocks queries that were already failing you. Think of it as removing the shoppers who were never going to convert so your budget concentrates on the ones who will.

Why Negative Keywords Matter More Than You Think

Every campaign, especially auto and broad-match ones, casts a wide net. That net is deliberately imprecise because Amazon is trying to discover which searches convert for you. The cost of that discovery is that you also pay for a lot of irrelevant clicks along the way. Without negatives, you keep paying for the same bad searches month after month. In our data, accounts that have never been cleaned up commonly carry a noticeable share of spend on search terms that have never produced a single order.

A negative keyword is the only PPC lever that can only help you. It never cuts a winner — it only stops you paying for searches that were already losing money.

The Two Types You Need to Know

Type Blocks Use When
Negative Exact Only that exact search phrase A specific converting-poorly term you still want related traffic from
Negative Phrase Any search containing that phrase A whole theme of irrelevant searches (e.g. “for kids”, “cheap”, “used”)

Negative phrase is your broad broom for sweeping out entire categories of bad traffic. Negative exact is your scalpel for surgically removing one specific term while keeping close variants alive. Most of your blocklist will be phrase-match negatives targeting themes, with exact negatives reserved for precise cases.

Your 20-Minute Build, Step by Step

Here is the exact process. Set a timer if it helps — the whole thing genuinely fits in a coffee break.

  • Minutes 0-5: Pull the data. Open your search-term report for the last 30-60 days. Sort by spend, highest first. This puts your biggest leaks at the top where they belong.
  • Minutes 5-12: Flag the obvious losers. Scan down the list and mark any search term with meaningful clicks and zero orders, plus anything clearly irrelevant to your product. Trust your eyes here — you know your product better than the algorithm does.
  • Minutes 12-17: Sort into themes. Group your flagged terms. Competitor brand names, wrong-use-case searches, bargain-hunter words like “cheap” or “free”, and wrong-variant searches usually cluster into a handful of themes.
  • Minutes 17-20: Add the negatives. Add theme clusters as negative phrase, one-off specific terms as negative exact, and apply them at the campaign or ad-group level.

The Starter Blocklist Every Seller Should Consider

Some negatives are nearly universal. While you always validate against your own data, these categories catch waste in the majority of accounts:

  • Bargain signals — “cheap”, “free”, “discount”, “wholesale” if you sell a premium product.
  • Wrong intent — “how to”, “diy”, “review”, “used” when they do not match your offer.
  • Wrong variant — colors, sizes, or formats you do not carry that share a root keyword with yours.
  • Irrelevant use cases — “for dogs” when your product is for humans, “for kids” when it is an adult product, and so on.
  • Competitor brands you do not want to pay for — though note that deliberately bidding on some competitor terms can be strategic; block only the ones bleeding money.

The Mistake That Wastes All Your Work

The number one negative-keyword error is being too aggressive. It is tempting to negate any term with a click or two and no sale, but a term needs enough clicks before “no orders” is a real signal rather than random chance. A search term with three clicks and no order tells you almost nothing. The same term with 40 clicks and no order tells you plenty. Set a threshold tied to your conversion rate: if you convert at 5%, wait until a term has roughly 30-40 clicks with no order before negating it. Cut too early and you may block a term that would have converted on click number five.

Make It a Habit, Not a One-Time Event

A blocklist built once and forgotten decays fast. New search terms surface constantly, especially in auto and broad campaigns, so waste rebuilds within weeks. The sellers who keep ACoS low review their search terms on a regular cadence — weekly is ideal, monthly is the minimum. The first cleanup takes 20 minutes; each maintenance pass afterward takes five.

Doing this by hand works, but it does not scale — across a large catalog, the search-term report grows faster than anyone can review it, and weeks of leaked spend pile up between manual passes. SellerGeni’s Autopilot continuously scans your search terms, surfaces negative-keyword candidates the moment they cross your waste threshold, and can apply them automatically, so the blocklist you build in 20 minutes today keeps building itself. Your first cleanup is the start of a system, not a chore you have to repeat forever.

See where your spend is leaking — get a free AI audit of your account.