Keyword Performance can used to find wasteful spending on terms that are not converting to sales.
Aggregate View
When opting not to filter the list, you can add terms as Negative Keywords in bulk or individually using the check boxes to the far right:
To add any term(s) discovered by Keyword Performance, click Add (X) AS Negative:
Select the match type: Exact, Phrase, or Broad
Select the campaign to add it to
Optional: Select a specific ad group to add it to (bypasses campaign level negative keyword)
Finalize your change by clicking Yes
This will add the Negative Keyword in real-time.
Filtered View
If you filter the list by clicking on a specific Search Term, you can add only the chosen term as a Negative Keyword
Select the match type: Exact, Phrase, or Broad
Select the campaign to add it to
Optional: Select a specific ad group to add it to (bypasses campaign level negative keyword)
Finalize your change by clicking Yes
This will add the Negative Keyword in real-time.