perfidious

[per-fid-ee-uhs]

adjective

deliberately faithless; treacherous; deceitful: a perfidious lover.

Nearby words

  1. perfectly,
  2. perfecto,
  3. perfector,
  4. perfector press,
  5. perfervid,
  6. perfidiously,
  7. perfidy,
  8. perfin,
  9. perfing,
  10. perfoliate

Origin of perfidious

First recorded in 1590–1600, perfidious is from the Latin word perfidiōsus faithless, dishonest. See perfidy, -ous

Related forms
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for perfidiousness


British Dictionary definitions for perfidiousness

perfidious

adjective

guilty, treacherous, or faithless; deceitful
Derived Formsperfidiously, adverbperfidiousness, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for perfidiousness

perfidious

adj.

1590s, from Latin perfidiosus "treacherous," from perfidia (see perfidy). Related: Perfidiously; perfidiousness.

Online Etymology Dictionary, © 2010 Douglas Harper