Two such words that he just drops into "casual" conversation when speaking to me are "hitherto" and "in perpetuity". I feel sometimes like he's talking to me as if we were discussing a legal case! I find it too formal. Most of time he's fine but using seemingly legal/formal language with me just makes my skin crawl. I've mentioned it and how it makes me feel and he thinks I'm being unreasonable. AIBU?