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."

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