unkindest

Adjective

unkind (comparative unkinder or more unkind, superlative unkindest or most unkind)

1. 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;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]...
2. (obsolete) 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.1582, Stephen Batman, transl., Batman vppon Bartholome His Booke De Proprietatibus Rerum, London, Book 7, Chapter 33
3. (obsolete) Having no race or kindred; childless.
   • O, had thy mother borne so hard a mind,
     She had not brought forth thee, but died unkind.1593, [William Shakespeare], Venus and Adonis, London: […] Richard Field, […], →OCLC