perfidious

[ per-fid-ee-uhs ]
/ pərˈfɪd i əs /

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

Example sentences from the Web for perfidiously

British Dictionary definitions for perfidiously

perfidious
/ (pəˈfɪdɪəs) /

adjective

guilty, treacherous, or faithless; deceitful

Derived forms of perfidious

perfidiously, adverb perfidiousness, noun