(your) heart isn't in it
Meaning: If your heart isn't in something you're doing, you don't really want to do it.
- Ali was studying to be a doctor, but his heart wasn't in it so he decided to follow his real dream and study film-making instead.
- We could tell that Sally's heart wasn't in it when she tried singing jazz, so we said she should stick to pop songs.
She's doing the photo shoot to promote her book, but her heart isn't in it. She looks