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

 

faithless

 adjective
adjective
BrE BrE//ˈfeɪθləs//
 
; NAmE NAmE//ˈfeɪθləs//
 
(formal)
 
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not loyal; that you cannot rely on or trust a faithless friend She had written a letter to her faithless lover.
See the Oxford Advanced American Dictionary entry: faithless