perfidious

[per-fid-ee-uhs]
adjective
deliberately faithless; treacherous; deceitful: a perfidious lover.

Origin:
1590–1600; < Latin perfidiōsus faithless, dishonest. See perfidy, -ous

perfidiously, adverb
perfidiousness, noun
unperfidious, adjective
unperfidiously, adverb
unperfidiousness, noun


false, disloyal; unfaithful, traitorous.


faithful.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perfidious (pəˈfɪdɪəs)
 
adj
guilty, treacherous, or faithless; deceitful
 
per'fidiously
 
adv
 
per'fidiousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
They utilize their blemishes with perfidious skill.
He dances energetically and has a wonderful time and he is completely unaware
  that his perfidious conduct has been revealed.
But any breakdown or inconvenience will quickly lead to condemnation of the
  management as both incompetent and perfidious.
This princess was not less cruel than haughty, nor less perfidious than impious.
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