disloyal

Etymology

Middle English, from Anglo-Norman desleal, desloial

adj

1. Not loyal, without loyalty.
   1536, Anne Boleyn, letter addressed to Henry VIII from the Tower of London, cited in Edward Herbert, The Life and Raigne of King Henry VIII, London: Thomas Whitaker, 1649, p. 383, Good your Grace, let not any light fancy, or bad Counsel of mine enemies withdraw your Princely favour from me; neither let that stain, that unworthy stain of a disloyall heart towards your good Grace, ever cast so foul a blot on your most dutifull Wife, and the Infant Princesse your daughter […]
   He told his mother he was glad to be back again. He sometimes felt as if it were disloyal to her for him to be so happy with Mrs. Erlich. 1923, Willa Cather, One of Ours, Book One, Chapter 15
   Embarrassed about leaving him, I asked him to accompany me. It would have been disloyal to let him broil in the heat of Cairo, while I went off to a summer resort. 1998, Tawfiq al-Hakim, “My Donkey and Hypocrisy”, in William Maynard Hutchins, transl., In the Tavern of Life and Other Stories, Boulder, Colorado: Lynne Rienner Publishers, page 65