perfidious

[ per-fid-ee-uhs ]
/ pərˈfɪd i əs /
SEE SYNONYMS FOR perfidious ON THESAURUS.COM

adjective

deliberately faithless; treacherous; deceitful: a perfidious lover.

Origin of perfidious

First recorded in 1590–1600, perfidious is from the Latin word perfidiōsus faithless, dishonest. See perfidy, -ous

OTHER WORDS FROM perfidious

Words nearby perfidious

perfectly, perfecto, perfector, perfector press, perfervid, perfidious, perfidy, perfin, perfing, perfoliate, perfoliate bellwort

Words related to perfidiousness

infidelity, fraud, disloyalty, falseness, disbelief, falsity, dishonesty, treason, betrayal, perfidy, doubt, unfaithfulness, skepticism, treachery, inconstancy

Example sentences from the Web for perfidiousness

British Dictionary definitions for perfidiousness

perfidious
/ (pəˈfɪdɪəs) /

adjective

guilty, treacherous, or faithless; deceitful

Derived forms of perfidious

perfidiously, adverb perfidiousness, noun