per·fid·i·ous

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

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

per·fid·i·ous·ly, adverb
per·fid·i·ous·ness, noun
un·per·fid·i·ous, adjective
un·per·fid·i·ous·ly, adverb
un·per·fid·i·ous·ness, noun


false, disloyal; unfaithful, traitorous.


faithful.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To perfidious
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World English Dictionary
perfidious (pəˈfɪdɪəs) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Perfidious is a GRE word you need to know.
So is paean. Does it mean:
present but not visible, apparent, or actualized; existing as potential:
any song of praise, joy, or triumph.
Example sentences
The cries and entreaties of the perfidious Saracen moved her not.
But any breakdown or inconvenience will quickly lead to condemnation of the
  management as both incompetent and perfidious.
Of course Lucia does go to the bridge game, just to see her perfidious strategy
  work itself out.
He dances energetically and has a wonderful time and he is completely unaware
  that his perfidious conduct has been revealed.
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