Definition of "unkind"

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;

1599 (first performance), William Shakespeare, “The Tragedie of Iulius Cæsar”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene ii]

Yet was it ne’er my Fate, from thee to findA Deed ungentle, or a Word unkind:When others curst the Auth’ress of their Woe,Thy Pity check’d my Sorrows in their Flow:

1715–1720, Homer, [Alexander] Pope, transl., “Book 24”, in The Iliad of Homer, volumes (please specify |volume=I to VI), London: […] W[illiam] Bowyer, for Bernard Lintott […], page 189, lines 968-971

Nobody meant to be unkind, but nobody put themselves out of their way to secure her comfort.

1814 July, [Jane Austen], chapter II, in Mansfield Park: […], volume I, London: […] T[homas] Egerton, […], page 24

Despite the bursitis, Dewey got in a good round of golf, though his cautious game inspired a reporter to make one of the week′s unkindest remarks: “He plays golf like he plays politics — straight down the middle, and short.”

1950 July 3, “Politicians Without Politics”, in Life, page 16

We had to learn that to refuse such gifts, which represented serious sacrifice, was more unkind than to accept them.

1974, Laurence William Wylie, Village in the Vaucluse, 3rd edition, page 175

In the strictness with which he holds this view he belongs in the company of the novelists I have cited, except that he is unkinder and less charitable than they are.

2000, Edward W. Said, “On Lost Causes”, in Reflections on Exile and Other Essays, page 540

[…] 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.

1582, Stephen Batman, transl., Batman vppon Bartholome His Booke De Proprietatibus Rerum‎, London, Book 7, Chapter 33

Crowes will not feed their yong til 9. daies old,Because their vnkind colour makes them doubtThem to be theirs;

1617, John Davies, Wits Bedlam‎, London, Epigram 116

O, had thy mother borne so hard a mind,She had not brought forth thee, but died unkind.The spelling has been modernized.

1593, 1896