What Is a Negative Keyword in Amazon Ads?
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Quick answer
A negative keyword in Amazon Ads is a targeting control that prevents an ad from showing when a shopper’s search term contains that word or phrase. It helps advertisers block irrelevant or low-return queries, so budget shifts toward searches that are more likely to convert. The result is typically lower wasted spend, fewer poor-quality clicks, and cleaner cost-per-click performance.
If your Amazon Ads CPC is going up, negative keywords are not a bid fix, but they are a demand-quality fix. They prevent your campaign from paying for clicks that are unlikely to produce a sale, which gives you better data and a clearer picture of what is actually driving costs.
How Negative Keywords Work in Amazon Ads
Amazon Ads evaluates each shopper search term against your targeting. A negative keyword tells Amazon not to show your ad when that term or phrase is present. You can add negative keywords at the campaign or ad group level, and use negative exact or negative phrase matching depending on how tightly you want to block a term.
For example, if you sell premium water bottles and “free” is a negative phrase keyword, searches like “free water bottle” or “free reusable bottle” can be suppressed. That keeps spend focused on purchase-intent searches.
Why Negative Keywords Matter When CPC Rises
A rising CPC often reflects increased competition or lower relevance. Negative keywords help on the relevance side: they reduce clicks that do not support your conversion goals. A campaign with fewer irrelevant clicks can produce better click-through and conversion signals, which may make your remaining spend more efficient.
This is especially important in automatic, broad, and phrase match campaigns. These campaign types can match a wider set of shopper searches, so the search term report often contains hidden waste.
Building a Negative Keyword List from Search Terms
Start with your Amazon Search Term report and look for terms that earn clicks but do not generate sales or meet your ROAS target. Add the clearest offenders first, then monitor the impact before expanding the list. Tools like Amazon Negative Keyword Tool by Todoza are designed to help identify those costly search terms in a ranked cleanup queue.
- Block exact mismatches such as sizes, colors, or product types you do not sell.
- Use phrase negatives for repeated word combinations instead of blocking single broad terms too quickly.
- Review on a schedule after enough click data to avoid removing terms too early.
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Negative keywords are not a one-time campaign cleanup. They are an ongoing control for keeping your ad spend aligned with real purchase intent. If rising CPC is driven by wasted search terms, improving that mix connects directly to the broader problem of why your Amazon Ads CPC increased and how to bring it back under control.