Diagnose both types of exclusion failure
A negative can fail by letting an unwanted search through or by preventing a legitimate customer search from participating. These require opposite corrections, so inspect the actual rule before widening the list. Positive keyword matching and negative matching do not behave identically. Google's current guidance says negatives need deliberate synonym and singular/plural coverage, while casing and misspellings are handled automatically. Verify current account behavior rather than following an old copied checklist.
Source checks: About negative keywords · About keyword matching options
Write an unwanted-intent definition
Describe the request you do not serve in one sentence, such as buying replacement parts without installation. Then identify the words and phrases that express that request in observed searches. Avoid excluding a broad product noun when that same product appears in the service you sell. A good negative list is a set of intent decisions with reasons; it is not a long vocabulary assembled from other businesses' accounts.
Construct a small test matrix
Use columns for sample query, desired eligibility, proposed negative, match type, scope, and expected result. Include unwanted singular and plural versions, useful service requests, reordered phrases, and queries with additional words. The matrix is a reasoning tool, not a guarantee of every live auction outcome. Review it with the person who understands the service range before making an account-wide exclusion that affects several unrelated campaigns.
Choose scope before applying the phrase
An account list affects a wider set of eligible inventory than an ad-group exclusion. Start at the narrowest scope that satisfies the business rule. If one campaign sells parts and another sells installation, a blanket 'parts' exclusion can create a conflict. Preserve a dated copy of the existing negatives and mark the proposed changes. This lets the next reviewer identify which rule produced an unexpected fall in useful traffic.
Investigate conflicts with valuable keywords
Check the positive keywords and landing-page service list against the new negatives. Look for a shared word that may block legitimate demand, especially 'commercial,' 'repair,' or a product category you both sell and service. Google's tools can help flag conflicts, but the business meaning still needs human review. If a valid request disappears, inspect the exclusion and scope before attributing the change to seasonality or weak customer demand.
Review fresh searches and quality after the change
Track whether the unwanted request still appears in visible terms and whether useful inquiries continue. Record any legitimate wording you had not considered. Adjust the specific rule rather than repeatedly broadening it without a test. A reduction in impressions alone does not tell you which demand was removed. Keep the matrix short enough to maintain, and revisit it when the business adds a service that an old exclusion would now block.
Worked example: illustrative figures
For example, an installation-only business wants to avoid product-only 'spare parts' requests. Its matrix includes 'spare parts,' 'spare part,' 'parts supplier,' and 'install replacement part.' The first three represent the excluded intent; the last may be suitable work. The owner tests narrow phrase or exact exclusions and avoids an unqualified account-wide 'part' negative. If 12 reviewed queries include 3 clearly unwanted variants, that is a classification sample of 25%, not a forecast of saved spend or complete coverage of hidden searches.
Two tests for every exclusion
Unwanted request
Does the chosen negative exclude the observed intent?
Useful request
Does installation or repair demand remain eligible?
Scope
Does the rule affect only the intended campaign?
New service
Would a future offering conflict with an old exclusion?
This is an original query-review method. Example queries are illustrative, not measured search volumes.
Your practical checklist
- Define the excluded request in plain language.
- Include useful and unwanted queries in the test matrix.
- Check singulars, plurals, and synonyms deliberately.
- Choose the narrowest appropriate exclusion scope.
- Preserve the previous negative list and change date.
- Review service conflicts when adding new offerings.
Your next action
Test your next three proposed negatives against five useful customer searches before applying them.
Questions about this task
Should I manually add every spelling mistake?
Current Google guidance says negative keywords account for casing and misspellings. Focus the review on intent, synonyms, singular/plural wording, and scope instead of copying redundant spelling lists.
Does negative exact match behave like positive exact match?
No. Negative match types have their own exclusion rules. Use the official negative-keyword examples and a task-specific query matrix rather than transferring assumptions from positive matching.
Sources and editorial notes
Prepared with AI-assisted research. Official sources are linked below; worked examples and checklists are Getting Found Local recommendations, not measured client outcomes.
Sources checked October 13, 2026. Platform interfaces and local resources may change; follow the current instructions on the linked official page.
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