Amazon Negative Keywords: The Strategy Most Sellers Get Wrong

Why Negative Keywords Matter

Every Amazon PPC campaign generates search term data — the actual queries shoppers typed before clicking your ad. In a typical broad or auto campaign, 30-50% of those search terms will be irrelevant or unprofitable. Without negative keywords, you pay for every one of those clicks.

Here is a concrete example: you sell premium stainless steel water bottles priced at ₹1,200. Your broad match campaign on "water bottle" triggers your ad for "water bottle ₹200," "plastic water bottle," and "water bottle for kids." None of these shoppers will buy your premium product, but you pay ₹8-₹15 per click. Over a month, that is thousands of rupees wasted on traffic that was never going to convert.

Negative keywords are how you stop the bleed.

Exact vs Phrase Negative Match

Amazon offers two negative match types:

Negative Exact Match

Blocks only the precise search term you specify. If you add "plastic water bottle" as a negative exact, your ad will still show for "cheap plastic water bottle" or "plastic water bottle blue." Use exact negatives when you want surgical precision — blocking one specific term without affecting related queries.

Negative Phrase Match

Blocks any search term that contains your phrase in the specified order. If you add "plastic water bottle" as a negative phrase, it blocks "plastic water bottle," "best plastic water bottle," and "cheap plastic water bottle online." Use phrase negatives when you want to block an entire category of queries.

The critical distinction: phrase negatives are more powerful but more dangerous. Adding "cheap" as a negative phrase will block "cheap water bottle" (good) but also "cheap stainless steel water bottle" (potentially a valid customer willing to consider your product). Always prefer exact negatives unless you are certain the phrase is irrelevant in all contexts.

Finding Wasteful Search Terms

Your search term report is the starting point. Download it from Campaign Manager > Reports > Search Term Report. Look for:

1. High spend, zero sales: Terms with 15+ clicks and zero orders. These are your immediate negation targets.
2. High ACoS terms: Terms where ACoS exceeds 3x your target. If your target ACoS is 20%, any term above 60% ACoS after 20+ clicks deserves scrutiny.
3. Obviously irrelevant terms: Search terms for a completely different product, a competitor brand name you do not want to target, or terms in the wrong language.
4. Low conversion rate outliers: Terms with decent clicks but conversion rates below 1% when your account average is 8-10%.

For a deeper dive into analysing search terms and structuring campaigns around them, see our campaign structure guide.

When to Negate: The Data-Driven Threshold

One of the biggest mistakes sellers make is negating too quickly based on insufficient data. Here is a framework:

• Minimum click threshold: Do not negate a term until it has at least 15-20 clicks. Anything less is statistically insignificant — you might negate a term that would have converted on click #16.
• ACoS threshold: If a term has 20+ clicks and its ACoS is above 3x your target with zero trend of improvement, negate it.
• Time window: Review at least 14-30 days of data. A term that performed poorly in week one might improve in week three as your listing gains reviews or your organic rank rises.
• Exception for clearly irrelevant terms: If the search term is obviously for a different product ("water bottle for hamster" when you sell 1-litre gym bottles), you can negate immediately without waiting for click thresholds.

Common Mistakes: The Two Extremes

Mistake 1: Not Negating at All

Many Indian sellers launch auto and broad campaigns and never look at the search term report. After three months, they have spent ₹50,000+ on clicks from irrelevant terms. The fix is simple: review search terms weekly for new campaigns and bi-weekly for mature campaigns.

Mistake 2: Negating Too Aggressively

The opposite extreme is equally harmful. Some sellers negate any term that does not convert after 5 clicks, or negate broad phrase matches that inadvertently block profitable variations. Signs you are over-negating:

• Your campaigns are running out of budget early because you have shrunk the eligible audience too much.
• Impressions have dropped significantly but ACoS has not improved proportionally.
• You find profitable search terms in your exact campaigns that are blocked by phrase negatives in your broad campaigns.

The solution is to audit your negative keyword list quarterly. Remove negatives that were added hastily and test them again with fresh data.

Campaign-Level vs Ad-Group-Level Negatives

You can add negative keywords at two levels:

• Campaign-level negatives: Block the term across the entire campaign, all ad groups. Use this for terms that are irrelevant to every product in the campaign — like negating "free" or competitor brand names you never want to appear for.
• Ad-group-level negatives: Block the term only in a specific ad group. This is essential for single-keyword ad group (SKAG) structures where you want a term to match in one ad group but not another. For example, you might negate "water bottle 500ml" in your broad campaign's ad group so it only triggers in your exact match campaign — giving you precise bid control. Learn more about this strategy in our campaign structure guide.

Automated vs Manual Negative Keyword Management

For sellers with fewer than 10 campaigns, manual weekly reviews are manageable. But as your account grows, the volume of search terms becomes overwhelming:

• A single auto campaign can generate 500+ unique search terms per month.
• An account with 30 campaigns might see 5,000-10,000 unique search terms monthly.
• Each term needs to be evaluated against click thresholds, ACoS benchmarks, and relevance.

This is where automation becomes essential. ScaleSkus currently manages over 189,000 unique search terms across our client accounts. Our system automatically:

• Flags terms that exceed spend thresholds with zero conversions.
• Recommends exact vs phrase negative match based on the term's relationship to other converting queries.
• Prevents over-negation by enforcing minimum click thresholds and checking for overlapping negatives.
• Promotes high-performing search terms from auto/broad campaigns into exact match campaigns for better bid control.

A Practical Negative Keyword Workflow

1. Weekly: Download search term report for all active campaigns.
2. Filter: Sort by spend descending. Focus on the top 50 terms by spend first.
3. Flag: Mark terms with 15+ clicks and zero orders.
4. Evaluate: For each flagged term, ask: "Would someone searching this ever buy my product?" If no, negate. If maybe, wait for more data.
5. Choose match type: Use exact negative for borderline terms. Use phrase negative only for clearly irrelevant categories.
6. Apply: Add negatives at the appropriate level (campaign or ad group).
7. Promote winners: Move search terms with good ACoS (below your target) into exact match campaigns. See our automation guide for how ScaleSkus handles this automatically.
8. Quarterly audit: Review your full negative keyword list. Remove any that were added prematurely.

Let ScaleSkus Handle Your Search Terms

Negative keyword management is one of the highest-ROI activities in Amazon PPC — and one of the most tedious. Most sellers either skip it or do it inconsistently. ScaleSkus automates the entire process: flagging wasteful terms, recommending negations, promoting winners, and preventing over-negation — all while managing 189,000+ search terms and counting. Combined with day-parting bid adjustments and ACoS reduction strategies, your campaigns run leaner every week. Start your free trial and stop paying for clicks that never convert.