noun, noun which may take the genitive case particle 'no'
one's heart; one's mind; one's inner thoughts
Refers to what one truly feels or thinks inside, often used in expressions like 胸中を明かす (to reveal one's true feelings) or 胸中を察する (to understand someone's feelings).
彼はなかなか胸中を明かさない。
He rarely reveals what's on his mind.
彼女の胸中
Her feelings were complicated.