noun, na-adjective
gentle disposition; mild character
Describes a person's innate gentle and calm nature. A formal, literary expression; in modern Japanese, 穏やかな性格 or 温和な人柄 are more common.
彼は資性穏和で、誰とでもすぐに打ち解ける。
He is of a gentle disposition and quickly gets along with anyone.
資性穏和な人柄がにじみ出た手紙だった。
It was a letter that revealed a mild and gentle character.
A Sino-Japanese compound (四字熟語) combining 資性 (innate nature) and 穏和 (gentle, mild). The exact historical derivation is uncertain; it is a literary expression not commonly used in modern speech.