negative keywords

how to determine them

[ffctas]

Hi,
I do quite a bit on adwords and have over 1000 in a number of ad groups. One of the words I use is a very general term and it accounts for 27% of my spend. However, it accounts for only 15% of sales. This is to be expected because it is so general.
I would like to make this term more efficient by adding good negative keywords. I have used the google "sandbox" and overture tools. I am sure there are many more negatives out there. Any thoughs of how to progress?
thanks
tom

[AdWordsAdvisor]

ffctas, IMO one great way to shop for negative keywords is to go to Google, and search on the keywords in the Ad Group in question.

Then look at the first hundred or so (how much time do you have?) search results, over there on the left.

These search results will be chock-full of negative keywords for you.

See any results that don't match the context in which you are using the keyword? Bingo! You've found yourself some negative keywords.

Kind of fun to do, too. But then I'm easily amused. ;)

AWA