Definition of perfidious adjective from the Oxford Advanced Learner's Dictionary

 

perfidious

 adjective
adjective
BrE BrE//pəˈfɪdiəs//
 
; NAmE NAmE//pərˈfɪdiəs//
 
(literary)
 
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that cannot be trusted synonym treacherous Word Origin late 16th cent.: from Latin perfidiosus, from perfidia ‘treachery’.
See the Oxford Advanced American Dictionary entry: perfidious