perfidious
[ per-fid-ee-uhs ]
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Part of Speech adjective
Origin + Etymology
Late 16th century; Latin from Latin perfidiosus, from perfidia ‘treachery’
Synonyms
  • betraying
  • deceitful
  • deceptive
  • double-crossing
  • faithless
  • misleading
  • shifty
  • two-faced
  • untrustworthy
Antonyms
  • loyal
  • honest
  • trustworthy
Definition
deliberately faithless; treacherous; deceitful
Example
A) The company went under after a series of perfidious deals. B) Lily's friends hated that she put up with her perfidious husband.
Usage Over Time

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