Add Negative Keywords to your ad group/campaign to help manage performance and for brand safety optimization. These utilize the same Match Types as Keywords do.
Broad match: keyword  | Syntax: none, type keyword normally Logic: Queries must relate to your chosen keyword (highest reach, lowest relevance)  | 
Phrase match: “keyword”  | Syntax: type keywords in “quotation marks” Logic: Queries must include your keywords in the order they're written (medium reach, medium relevance)  | 
Exact match: [keyword]  | Syntax: type keywords in [brackets] Logic: Queries must exactly match your keyword (lowest reach, highest relevance)  |