disloyal

Adjective

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...
   • […] Norway himself, With terrible numbers, Assisted by that most disloyal traitor The thane of Cawdor, began a dismal conflict; - c. 1606 (date written), William Shakespeare, “The Tragedie of Macbeth”, in Mr. William...
   • 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:

   Synonyms: faithless perfidious treacherous unfaithful unloyal recreant booky dastardly disleal disloyal double-crossing double-dealing double-faced double-hearted doublehearted false falseheart false-hearted guiled guileful hollow-hearted illoyal infidelitous insidious