彼の本音を聞きたい。
I want to hear how he really feels.
酒が入ると、つい本音が出てしまう。
Once I've had a drink, my true feelings slip out.
本音を言えば、その仕事は引き受けたくなかった。
To be honest, I didn't want to take on that job.
日本人は建前と本音を使い分けるとよく言われる。
It is often said that Japanese people distinguish between their public stance and their true feelings.