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perfidious

[per-fid-ee-uh s] /pərˈfɪd i əs/
adjective
1.
deliberately faithless; treacherous; deceitful:
a perfidious lover.
Origin
1590-1600
1590-1600; < Latin perfidiōsus faithless, dishonest. See perfidy, -ous
Related forms
perfidiously, adverb
perfidiousness, noun
unperfidious, adjective
unperfidiously, adverb
unperfidiousness, noun
Synonyms
false, disloyal; unfaithful, traitorous.
Antonyms
faithful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un perfidious

perfidious

/pəˈfɪdɪəs/
adjective
1.
guilty, treacherous, or faithless; deceitful
Derived Forms
perfidiously, adverb
perfidiousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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