Exclude what the business cannot serve
A negative keyword helps prevent a Search ad from matching an unsuitable search. The point is not to create the longest exclusion list; it is to stop paying for intent that does not fit the offer.
Begin with your actual service, location and customer. A business selling plumbing repairs may exclude employment or training intent. A college advertising plumbing courses would make the opposite decision. A generic negative list copied from another account can remove relevant customers.
Negative matching differs from positive keyword matching
For Search, a negative broad match generally blocks searches containing all its terms, even in a different order. Negative phrase match requires the phrase in that order; negative exact match blocks the complete matching search without additional words. Negative keywords do not automatically cover close variants. Google's negative keyword guidance explains the rules and how other networks differ.
Review spelling, singular/plural forms and the actual query. Do not assume that excluding one form also excludes every related meaning. Avoid treating these Search rules as universal placement controls for Display or Video.
Worked example: one query, three possible exclusions
Hypothetical Search example. A repair-only plumber receives the query “plumbing apprenticeship Brisbane”. It does not employ apprentices or sell courses.
- A negative exact for that complete query excludes a narrow observed search.
- A negative phrase for “plumbing apprenticeship” addresses that phrase across additional words.
- A broad negative for “apprenticeship” excludes a wider training-related intent.
The broader choice may fit this business, but first confirm that the term cannot describe a paid service it offers. Record the reason. After applying it, check that the intended repair searches remain eligible.
Review actual search terms with business context
- Read the query, not just the selected positive keyword.
- Classify whether the searcher wants the service you sell.
- Check conversion delay and lead quality before declaring a relevant query unproductive.
- Choose the smallest sensible exclusion scope: ad group, campaign or shared list.
- Check matching behaviour and conflicts before saving.
A term with no conversion from two clicks is not enough evidence to label it permanently wasteful. Conversely, a clearly unrelated request does not need weeks of spending to establish that you do not sell the requested product.
Avoid blocking a useful brand or service
Suppose a repair business services Brand X equipment. A search about buying spare parts may be unsuitable, while “Brand X repair near me” is useful. Excluding “Brand X” entirely removes both. Separate product-purchase intent from the brand rather than treating every mention as irrelevant.
Conflicts can also occur between a campaign's positives and a shared negative list. Keep a small audit trail: term, match type, scope, reason and date. Recheck it when the business adds a new service.
Use negatives with structure and measurement
Negative keywords do not fix inaccurate location targeting, a broken destination or a weak conversion definition. Use the keyword-to-page map, audience controls and tracking checks together. Managed campaign review should preserve the intended customer journey while excluding unsuitable traffic.