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.
He is of a gentle disposition and quickly gets along with anyone.
It was a letter that revealed a mild and gentle character.
温和 is a common word meaning 'mild, gentle' (weather, personality). 資性穏和 is a much rarer, formal compound specifically for innate character.
穏やか is the everyday adjective for 'calm, gentle, mild'. 資性穏和 is a stilted, literary alternative.
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.