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Definition of perfidious - 2 dictionary results
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per⋅fid⋅i⋅ous

  [per-fid-ee-uhs]
Use perfidious in a Sentence
–adjective
deliberately faithless; treacherous; deceitful: a perfidious lover.
Origin:
1590–1600; < L perfidiōsus faithless, dishonest. See perfidy, -ous

Related forms:
per⋅fid⋅i⋅ous⋅ly, adverb
per⋅fid⋅i⋅ous⋅ness, noun

Synonyms:
false, disloyal; unfaithful, traitorous.

Antonyms:
faithful.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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per·fid·i·ous   (pər-fĭd'ē-əs)   
adj.  Of, relating to, or marked by perfidy; treacherous. See Synonyms at faithless.
per·fid'i·ous·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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