Meaning & use
Perfidious
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Deliberately deceitful and untrustworthy; treacherous.
See it in a sentence
The general was betrayed by a perfidious ally who secretly sided with the enemy.
History remembers him as a perfidious courtier who switched loyalties whenever convenient.
A note on using this word
The phrase "perfidious Albion," a disparaging nickname for England, has been used since the 18th century to accuse Britain of treaty-breaking and duplicity in foreign affairs.
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