1 general:: Phrase(s): one’s frame of mind Fig. one’s mood or mental state. • My frame of mind is sort of low at the moment. I’ve had a very bad day.
McGrawhill's American Idioms And Phrasal Verbs
2 general:: Mental or emotional attitude or mood, as in You have to be in the right frame of mind to enjoy hiking in the rain. This idiom was first recorded in 1665.
American Heritage Idioms