One's inner feelings, thoughts, or true motives — what is in a person's heart or mind.
その決断の裏にある彼の心中を知ることは難しい。
It's difficult to know what was in his heart behind that decision.
取材で彼女の心中を探ろうとしたが、答えは曖昧だった。
We tried to probe her true feelings in the interview, but her answers were vague.
面接では自分の心中を率直に伝えることが大切だ。
In an interview, it's important to express your true thoughts honestly.