I'm a native english speaker, but with a terrible vocabulary, I sometimes find myself struggling (even after searching through an online thesaurus) to remember words (that I've heard before) to convey a thought or feeling. Is it OK to post such questions on this site? (Especially if I think that such questions would benefit a non native english speaker?)
I like answering those sorts of questions, because I enjoy finding a word that precisely expresses my meaning. Just be sure to give a detailed description of what you're trying to say, including whether you want a negative, positive, or neutral connotation. It also helps to have an example sentence that shows how you would like to use the word, if you have a specific context in mind.
You shouldn't limit yourself to asking native speakers though. Some of our non-native speakers are quite fluent and have a unique perspective.