There are several ways to set negative keywords. All methods can be used simultaneously.
Specify individual negative keywords (negative keywords that consist of one word) directly for a keyword in the Keyword parameter.
Moving negative keywords to the group or campaign level makes configuration easier and reduces the risk of exceeding the limit on keyword length (4096 characters).
If a negative keyword that is set on the group or campaign level is completely included in a keyword, the negative keyword isn't applied to this keyword.