perfidious

adjective
UK: /pəˈfɪdiəs/
US: /pərˈfɪdiəs/

  1. Unable to be trusted, or showing no loyalty; deceitful and treacherous.

    1. The perfidious man betrayed his friends for money.
    2. Her perfidious actions led to the downfall of the entire organization demonstrating her lack of integrity.

Synonyms

deceitful disloyal untrustworthy faithless treacherous
perfidious noun

  1. The quality or state of being perfidious; treachery.

    1. His perfidy was shocking to everyone.
    2. The perfidy of the double agent was eventually uncovered risking international security.

Frequently Asked Questions

The phonetic transcription of "perfidious" is /pəˈfɪdiəs/ in British English and /pərˈfɪdiəs/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "perfidious": deceitful, disloyal, untrustworthy, faithless, treacherous.

Example usage of "perfidious": "The perfidious man betrayed his friends for money.". More examples on the page.