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Use "unkindness" in a sentence
"Her earnest, eloquent justification of herself, and her lofty sense of female honor, are rendered more affecting and impressive by that chilling despair that contempt for a life which has been made bitter to her through unkindness, which is betrayed in every word of her speech, though so calmly characteristic."
"And in a way, they remind me of juvenile ravens, because they tend to collect in a gaggle [although technically and grammatically and practically, the term is an "unkindness"], where they spend an inordinate amount of bandwidth and space commenting on the writing field and promoting the new works of the younger writers, whom they wish to join."
"Strange, that what I called 'unkindness' for so many years, in departing should have left to me such a sudden desolation!"