He's a 'mechanical' genius. [=he is a person who is very smart about machines]
He's not 'mechanically' inclined. [=he is not knowledgeable about machinery]
The flight was delayed because of 'mechanical' problems/difficulties.
(..) Hey! Because you are making me tense. Give me the bottle. I need another drink. Maybe if we just took our clothes off and got into bed? What? No! I can't. It's too mechanical. Here, just take the bucks. No! Forget it. I'll just go. Sorry I screwed everything up. No, I'm sorry too. (..)2016 Café Society