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In case you don’t know what are negative keywords (a.k.a excluded keywords in Yahoo), check the

http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=63235

Google Adwords Search query performance report

The 1st place to look for negative keywords is in your Google Adwords campaigns. It’s the actual report showing for which keywords your ads got triggered in broad, phrase and extended broad match. So you can use the report to valuable keywords which you don’t want to your ads to show up for and add them to your campaigns. Go to reporting tab and create a new report. Select search query performance report, choose date range, any additional data you need under Advanced Settings and use the report to identify negative keywords.

Adwords Search Query Performance Report

Google Adwords Keyword Ideas

Google Adwords provides new keyword ideas based on your campaign, keywords, budget and performance. This is a very valuable source to find lots of negative keywords that you might not have thought about. Log in to your Adwords account and click on opportunities tab, download the reports and get the negative keywords you don’t want your ads to show up for.

Adwords Keyword Suggestion

Google Adwords Keyword Tool

Google keyword tool is a free tool to ideas for keywords to advertise and negative keywords which aren’t to be aadvertised. Check the following Url https://adwords.google.com/select/KeywordToolExternal and type the keyword phrases of your product/ services. The tool gives you keyword suggestions and you will be able to find a lot of keywords not related to your products or services. Add them to your negative keyword list.

Adwords Keywords Suggestion Tool

Thesarus / Dictionary

If you want to expand your negative keyword list using the existing list of negative keywords, then use the dictionary or thesaurus to find keyword suggestions. If you find the suggestions relevant, add it to your list.

http://dictionary.reference.com/

http://thesaurus.reference.com/

Bonus: Maximum limit of adding negative keywords

Negative keywords can be added at account, campaign, ad group and keyword level and they differ based on search engines. Below table should help you get a better understanding.

A – Available
N.A. – Not Available
*Per Campaign
**Maximum characters allowed