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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