unkindness; heartlessness; inhumanity
Describes a lack of human warmth or compassion; often used for cold, unfeeling behavior.
Everyone was hurt by his heartless attitude.
I can't say such an unkind thing.
Compound of 不 (negative prefix) and 人情 (humanity, kindness). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of lacking human warmth.