Definition of self-righteous adjective from the Oxford Advanced Learner's Dictionary

 

self-righteous

 adjective
adjective
BrE
 
; NAmE
 
(disapproving)
 
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feeling or behaving as if what you say or do is always morally right, and other people are wrong synonym sanctimoniousExtra examples He was in one of his self-righteous moods. She reacted with self-righteous indignation. We have to learn tolerance and to stop being so self-righteous.
See the Oxford Advanced American Dictionary entry: self-righteous