Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: perfidiosus, from perfidia 'disloyalty', from perfidus 'disloyal', from per fidem decipere 'to deceive by trust'

perfidious

 adjective
     
per‧fid‧i‧ous literary
someone who is perfidious is not loyal and cannot be trusted [= treacherous]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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