Malapropos
Part of speech: adjective
Definition: out of place; inappropriate
Inappropriate
Part of speech: adjective
Definition: Not appropriate; not suitable for the situation.
Example sentence: Every once in a while I get the highly inappropriate proposal which is like, 'Wow, Really! You don't even know me and I don't know you at all, and you want that to happen? Tonight? Ok, I get off work at 7.30.'