i Register
In some senses, unkind is marked as obsolete. Watch for register when choosing this word.
adj
Lacking kindness, sympathy, benevolence, gratitude, or similar; cruel, harsh or unjust; ungrateful.
Judge, O you gods, how dearly Caesar loved him! This was the most unkindest cut of all; For when the noble Caesar saw him stab, Ingratitude, more strong than traitors’ arms, Quite vanquish’d him: then burst his mighty heart;
Yet was it ne’er my Fate, from thee to find A Deed ungentle, or a Word unkind: When others curst the Auth’ress of their Woe, Thy Pity check’d my Sorrows in their Flow:
Not kind; contrary to nature or type; unnatural.
[…] A Feauer is an vnkinde heate, that commeth out of the heart, and passeth into all the members of the bodye, and grieueth the working of the bodye.
Crowes will not feed their yong til 9. daies old, Because their vnkind colour makes them doubt Them to be theirs;
Having no race or kindred; childless.
O, had thy mother borne so hard a mind, She had not brought forth thee, but died unkind.