After eight years running Amazon PPC, the deepest hole I ever fell into was—not taking negative keywords seriously. Back when I was first getting into FBA, ACoS shot past 60%. I kept assuming my bids were too high, cut them until I barely had any impressions, and ACoS was still 45%. When I finally dug into the search term report, I found half my spend was going to completely irrelevant terms. It still stings to think about.
For a deeper dive, see our advanced PPC guide.Negative keywords are the cheapest, highest- ROI return lever in PPC. It costs you nothing in ad spend, but it can cut ACoS by 10-20 points. This playbook took me more than two years of hands-on campaigns to work out, and today I am handing all of it to you.
1. Why You Must Have a Negative Keyword Strategy
Plenty of sellers turn on auto campaigns and then walk away. Amazon's automatic matching has a wild imagination - you sell a yoga mat and it will happily match you to yoga pants, exercise equipment or a cat mat. Those terms are not impossible to convert on, but the conversion rate is abysmal and you are just burning money.
The Two Levels of Negative Keywords
| Level | Scope | When to use it |
|---|---|---|
| Campaign Negative | Whole campaign | Totally irrelevant broad terms, competitor brand names |
| Ad Group Negative | Single ad group | Terms irrelevant to this group, but possibly relevant in another |
2. Finding the Terms to Negate: the Search Term Report Method
There is only one source for negative keywords Search Term Report: pull the last 30 days of search term report at least once a month. My golden filter rules are:
- High spend + high ACoS (above 50%) + zero conversions → negate immediately : these terms are your single biggest source of waste. Do not hesitate for a second.
- High spend + high ACoS + 1-2 orders → consider negating : if a term needs 100 clicks to produce one order, its ROI is negative. Negate it.
- Low spend + low conversion → leave it for now : there may not be enough data yet. Watch it for another two weeks.
- Completely irrelevant → negate at once : even with a single click, negate it if the meaning is unrelated.
The tool I use for batch search term analysis is ylishi.tools PPC Analyzer : it flags every term worth negating in seconds. Clicking through Seller Central one by one is far too slow.
3. Negative Exact vs Negative Phrase
Many sellers do not realize negative keywords have match types too. That choice matters enormously:
| Negative match type | Meaning | Typical use |
|---|---|---|
| Negative Exact | Only negates when the shopper's search matches your term exactly | For specific long-tail terms such as blue yoga mat extra thick |
| Negative Phrase | Negates whenever the shopper's search contains your phrase | Widens the negative net - negating free shipping, for example |
Rule of thumb: use negative exact most of the time. Overusing negative phrase causes friendly fire - negate cheap and you correctly block shoppers searching cheap yoga mat, but if the same word turns up inside a phrase like not cheap quality, your ad stops serving there too.
4. When to Negate at the Campaign Level
- Competitor brand names: if you do not want to spend on competitor brand terms - say you sell your own brand of yoga mats and want to block names like Manduka or Liforme - negate them at the campaign level.
- Broad category terms: terms as generic as fitness equipment belong on the campaign-level negative list.
- Negative attributes: words like used, second hand, cheap and free should be negated at the campaign level.
5. Dynamic Negation: Putting Your Negative List on a Review Cycle
Negative keywords are not a set-and-forget task. On the last week of every month I run a fixed negative keyword review:
- Pull the latest search term report
- List everything negated so far and check whether new terms need adding
- Check whether any previously negated term should now be released because the competitive landscape has changed
- If a term converted badly only because it was the off-season, release it and retest once peak season arrives
6. Negative Keyword Disasters I Have Seen Firsthand
Case 1: over-negating crushed impressions A friend of mine sells kids' toys and negated the word toy at the campaign level, because it was the broad term his auto campaign kept matching to. Impressions across the whole campaign fell 80% - toy is a core term, and although it did not convert well on its own, it is a key relevance signal for Amazon.
Lesson: never negate a core seed term lightly. Better to build a separate manual campaign with a low bid than to negate it inside your auto campaign.
Case 2: product-attribute confusion cost conversions A seller of wireless chargers negated the word cord, reasoning that a wireless charger needs no cord. But shoppers search for cordless charger - which contains cord - and his ad stopped showing. Cordless was exactly the selling point he wanted to own.
Lesson: before you add a negative phrase, think hard about whether that word could appear inside a positive compound.
Find Wasted Terms with the PPC Analyzer
Free analysis of your search term report, flagging high-waste keywords in one click.
Start analyzing →
