Definition of self-righteous adjective from the Oxford Advanced American Dictionary

 

self-righteous

 adjective
adjective
 
(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 sanctimonious
self-righteously
 
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adverb
self-righteousness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: self-righteous