What is a Negative Keyword?

A negative keyword is a word or phrase you add to an Amazon ad campaign to prevent your ads from appearing when a shopper's search includes that term. For example, if you sell premium leather wallets and add "cheap" as a negative keyword, your ad won't appear for searches like "cheap leather wallet"—saving you the cost of clicks that are unlikely to convert into sales at your price point.

Types of Negative Keywords on Amazon

• Negative Exact Match: Blocks your ad only when the search query exactly matches the specified term
• Negative Phrase Match: Blocks your ad whenever the search includes that phrase in any form or order
• Campaign-level negatives: Apply across all ad groups within the entire campaign
• Ad group-level negatives: Applied more granularly for specific targeting scenarios
• Both types work together to build a progressively tighter, more efficient campaign structure

Why Negative Keywords Are Essential for PPC Efficiency

Without negative keywords, Amazon's broad and automatic match types will trigger your ads for loosely related or entirely irrelevant searches. This drives up spend without generating relevant clicks, inflating your ACoS and eating into margins. Negative keywords act as a precision filter—they sharpen your targeting, reduce wasted budget, and ultimately improve your return on ad spend (ROAS).

How to Build a Negative Keyword List

• Download and review your Search Term Report weekly—flag zero-conversion, high-spend queries
• Exclude search terms with significant clicks but no sales over a meaningful time window
• Block competitor brand names unless you're intentionally running conquest campaigns
• Remove terms for products you don't carry—wrong material, wrong size, wrong use case
• Use auto campaigns as a discovery engine specifically for surfacing negative keyword candidates

Common Negative Keyword Mistakes to Avoid

Being overly aggressive with negatives is just as damaging as ignoring them. Blocking terms that are loosely relevant can inadvertently cut off profitable traffic. Equally, failing to update your list as customer search behavior evolves will allow new wasted spend to creep in. Treat your negative keyword list as a living document—review and refine it at least bi-weekly as part of your regular PPC hygiene.