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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for perfidiously

British Dictionary definitions for perfidiously

perfidious
/ (pəˈfɪdɪəs) /

adjective

guilty, treacherous, or faithless; deceitful

Derived forms of perfidious

perfidiously, adverbperfidiousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012