Etymology
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unkindness (n.)

c. 1300, "state or character of being unkind, lack of natural regard or proper consideration," from un- (1) "not" + kindness (n.), or from unkind (adj.) + -ness. Meaning "an unkind act" is from c. 1500.

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Definitions of unkindness

unkindness (n.)
lack of sympathy;
From wordnet.princeton.edu