Great online thesaurus: Aiksaurus
This is my favorite online thesaurus to date, and I only just discovered it tonight while searching hopelessly for a pair of words that I have yet to find...but that's a different story. However, in searching for something that would spark to mind the perfect pair of words, I got a link to Aiksaurus. It gives the most generous results I've found...and generous is what you need when you're hunting for something you can't define or describe but you'll know it when you see it.
So I kept erasing the tail end of the url until I came to the story of this neat tool I'd never heard of: an old undergrad project by Jared Davis. Thanks, Jared!