one's heart not in it
原文解釋: you do not feel something is exciting or interesting enough to do
1. if your heart is not in it, you will never succeed in doing anything.
So you have to learn to have your heart set on the things you are doing.
2. The thing is, I have always wanted to be an actor.
My job as a stockbroker paid me a good salary but my heart just wasn't in it.
So, I've decided to quit my job and follow my dream.
3. I tried to look interested, but my heart wasn't in it.
4. I tried to learn some lines but my heart wasn't really in it.