In a sentence
Perfidious in a sentence
Here is an example sentence showing perfidious in a sentence.
His perfidious betrayal of his allies cost them the campaign.
Synonyms
Antonyms
loyalfaithfultrustworthy
Keep going
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done with careful and thorough effort
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agreeable to the taste or acceptable to the mind
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Common questions
Questions about “perfidious”
Perfidious (adjective) means deliberately treacherous or disloyal
Here is perfidious used in an example sentence: "His perfidious betrayal of his allies cost them the campaign."
Common synonyms for perfidious include treacherous, faithless, duplicitous, traitorous.
Antonyms of perfidious include loyal, faithful, trustworthy.
Perfidious is a GRE-level vocabulary word worth knowing for the Verbal section.
Learn words the way the GRE tests them.
Vocabulary sticks when you meet it in real sentences. Practise these words inside text completion and sentence equivalence questions.