本心 ほんしん
honshin

Noun

1. true feelings; real intention; one's heart

かれ くちやかましいが本心 ほんしん わるくない。
karewa kuchiyakamashiiga honshinwa warukunai.
He grumbles a lot, but deep down he's not a bad guy.
Noun

2. one's right mind; one's senses; one's conscience