perfidious — deliberately faithless; treacherous; deceitful
Part of speech: ADJECTIVE
Definition: deliberately faithless; treacherous; deceitful
Pronunciation (IPA): /pərˈfɪdiəs/
Example Sentences
- The perfidious friend sold my secret recipe to my rival restaurant for money.
- His perfidious nature was revealed when he leaked confidential information to competitors.
- The perfidious cat pretended to be asleep while secretly plotting to steal my sandwich.
perfidious
ADJECTIVE[/pərˈfɪdiəs/]
deliberately faithless; treacherous; deceitful

The perfidious advisor smiles at the king while secretly passing battle plans to the enemy.

Fastidious facade hides perfidious and insidious betrayal
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🎤Pronunciation
🌳Etymology
Origin
From Latin 'perfidiosus', derived from 'perfidus' meaning 'faithless' or 'treacherous', which combines 'per-' (through/thoroughly) with 'fidus' (faithful, from 'fides' meaning faith or trust).
Breakdown
per- (through/thoroughly) + fid (faith, trust) + -ious (adjective suffix) = perfidious (deliberately faithless or treacherous)
🎵Rhyme
🔗Collocations
📝Examples
“The perfidious friend sold my secret recipe to my rival restaurant for money.”
“His perfidious nature was revealed when he leaked confidential information to competitors.”
“The perfidious cat pretended to be asleep while secretly plotting to steal my sandwich.”
“Shakespeare often portrayed perfidious characters who appeared loyal but harbored evil intentions.”
📚Related Words
Synonyms
Antonyms
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