Most underperforming Amazon accounts aren’t bidding too low or writing bad ads. They’re quietly paying for clicks that will never convert — and nobody’s pruning them. Negative keywords are the fix, and they’re the single highest-ROI lever most sellers ignore.
What negative keywords do
A negative keyword tells Amazon: do not show my ad for this search term. That’s it. Used well, they stop your budget from bleeding into irrelevant or unprofitable searches so more of it flows to the terms that actually sell.
There are two types:
- Negative exact — blocks one specific search term. Surgical.
- Negative phrase — blocks any search containing that phrase. Broader.
Where the waste hides
Pull your search term report and look for terms that are getting clicks but no (or very few) sales. Common culprits:
- Wrong intent — someone searching “cheap” or “used” when you sell premium.
- Wrong product — close-but-not-your-product terms (you sell dog beds, you’re showing for “dog crate”).
- Competitor/brand terms that never convert for you.
- Too-broad terms eating spend with sky-high ACoS and no orders.
A useful rule of thumb: if a search term has spent more than ~1.5–2x your target cost-per-acquisition with zero orders, it’s a candidate to negate.
How to do it without hurting good traffic
- Give terms enough data first. Don’t negate after two clicks — wait for a meaningful sample (often 10–15+ clicks) so you’re not killing a term that just hasn’t converted yet.
- Negate at the right level. Block the term in the campaign that’s wasting money, not account-wide, unless it’s universally irrelevant.
- Use negatives to sculpt, not just block. Adding negatives to broad/auto campaigns funnels winning terms into tighter exact-match campaigns where you control bids.
- Make it a habit. Search term reports should be reviewed regularly — wasted spend regrows if you only prune once.
Done consistently, negative keywords lower ACoS and free up budget for your best converters at the same time. It’s the rare optimization with no downside.
Want us to find the wasted spend hiding in your account? Get a free audit — we’ll show you the exact terms.