Synonyms of perfidious in English:

perfidious


See US English definition of perfidious

See UK English definition of perfidious

See Spanish definition of pérfido

adjective

1‘a perfidious lover’

SYNONYMS
treacherous, duplicitous, deceitful, disloyal, faithless, unfaithful, traitorous, treasonous, false, untrue, double-dealing, dishonest, two-faced, Janus-faced, untrustworthy
rare false-hearted, double-faced, truthless, Punic
ANTONYMS

faithful, loyal