プログレッシブ和英中辞典(第３版)の解説
ほんしん【本心】
1 〔正気〕one's senses [mind]; 〔良心〕one's conscience
- 本心を失う〔気が狂う〕
lose [go out of] one's mind／be out of one's senses - 本心に立ち返る〔迷いがさめる，狂気がなおる〕
return to one's right mind
2 〔真意〕one's real intention(s); 〔心の底〕one's heart
- そのようになさるあなたの本心が分からない
I can't understand your 「real intention [motive] in behaving like that. - 彼が本心で言っているとは思えない
I don't think 「he is saying what he really thinks [he really means it.] - 彼は本心から話しているのだろうか
Can he be speaking from his heart? - 本心を明かすことはないだろう
He will never reveal his real intentions. - 彼にはすまないことをしたと本心では感じている
At bottom [heart] I feel very bad about what I did to him.／What I did to him weighs on my conscience.