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A negative keyword is a keyword in a PPC campaign for which you do NOT want your ads to show.
From [adwords.google.com...] As for the best way to search webmasterworld, there's some good advice in this thread [webmasterworld.com] (msg#9). arran.
Negative Keyword - If your keyword is tennis shoes and you add the negative keyword -red, your ad will not appear when a user searches on red tennis shoes. You can apply this option for a keyword at both the Ad Group and campaign level.