Are you talking about keywords you've entered into a campaign on Google Adwords which are showing as 'Optimal but Ineffective' ?
Can you tell us what the words are? Which platform you are using for the site? Are you using an external advertising agency such as Yahoo! or Google?
Basically, any more information than the bullshit gooble-de-gook above and I/someone else might be able to help.
Or are you just posting randomly on forums with the SEO keywords as your signature in a bid to ascertain organic link backs etc.?
Either way, I want to set you on fire.