- unkindly (adj.)
- early 13c., "not natural, unnatural," from un- (1) "not" + kindly (adj.). From c. 1300 as "without natural affection, unfraternally." Old English had ungecyndelic.
- unkindly (adv.)
- c. 1200, "unsuitably, improperly," from un- (1) "not" + kindly (adv.). From mid-15c. as "discourteously, maliciously."