perfidious

From Latin perfidiōsus (“treacherous”), from perfidia.

• (US) IPA^(key): /pɚˈfɪdi.əs/
• (Received Pronunciation) IPA^(key): /pəˈfɪdi.əs/

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perfidious (comparative more perfidious, superlative most perfidious)

1. Of, pertaining to, or representing perfidy; disloyal to what should command one's fidelity or allegiance. [from late 16th c.]
   • 1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, [Act II, scene ii]:

     TRINCULO (speaking about Caliban): By this light, a most perfidious and drunken / monster: when his god's asleep, he'll rob his bottle.

   • 1851, Oliver Goldsmith, “ch. 26”, in William C. Taylor, editor, Dr. Goldsmith's History of Rome:

     The perfidious Ricimer soon became dissatisfied with Anthe'mius, and raised the standard of revolt.

   • 1905, Andrew Lang, “ch. 14”, in John Knox and the Reformation:

     [S]he knew Huntly for the ambitious traitor he was, a man peculiarly perfidious and self-seeking.

   • 2005 June 21, “Archived copy”, in Art: The Velocipede of Modernism‎, archived from the original on 12 November 2011, retrieved 5 September 2021:

     When the Nazis branded Feininger a "degenerate artist" in 1937, he left 54 paintings for safekeeping with a Bauhaus friend named Hermann Klumpp. After the war, and for the rest of Feininger's life, the perfidious Klumpp refused to give them back.

• (disloyal): disloyal, traitorous, treacherous, unfaithful

• perfidy

• Perfidious Albion on Wikipedia.Wikipedia