upright character; noble nature
Describes a person's innate moral quality as upright and refined. Literary and somewhat old-fashioned; in modern Japanese, expressions like 性格が正しい or 高潔な人柄 are more common.
He was known as a person of upright character.
高潔 means 'noble' or 'high-minded' and is more common in modern Japanese, while 資性端正 is a rare literary compound emphasizing innate moral correctness.
品行方正 also means 'upright conduct' but focuses on behavior rather than innate character; 資性端正 stresses inherent nature.
A four-character compound of classical origin, combining 資 (innate quality), 性 (nature), 端 (correct), and 正 (righteous). The exact historical derivation is uncertain; it is a literary expression not commonly used in modern speech.