innate character; temperament; disposition
A formal, somewhat literary term for one's inborn nature or temperament. Rare in everyday conversation; more common in written or academic contexts.
His innate disposition is gentle, and he quickly gets along with anyone.
This work clearly reflects the author's temperament.
Composed of 気 (spirit, mind) and 稟 (innate nature, receive from heaven). The exact historical derivation is uncertain, but the compound is used in classical and literary Japanese to refer to one's inherent disposition.