• Webster's Revised Unabridged Dictionary
    • n Unkindliness Unkindness.
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Century Dictionary and Cyclopedia
    • n unkindliness The character of being unkindly; unkindness; unfavorableness.
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Chambers's Twentieth Century Dictionary
    • n Unkindliness want of kindliness
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In literature:

I'm beginning to grasp the unkindliness of priests.
"The Research Magnificent" by H. G. Wells
Lying back in his chair he thought of them thus, without unkindliness, even with a dash of humour.
"Australia Felix" by Henry Handel Richardson
The first enemy which the believer has to fight against is sensuality and the last is unkindliness.
"The Great Events by Famous Historians, Vol. 1" by Various