Etymology
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self-righteous (adj.)

"righteous in one's own esteem," 1670s, from self- + righteous. Related: Self-righteously; self-righteousness "reliance on one's supposed righteousness."

updated on April 19, 2022

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Definitions of self-righteous from WordNet

self-righteous (adj.)
excessively or hypocritically pious;
Synonyms: holier-than-thou / pietistic / pietistical / pharisaic / pharisaical / sanctimonious
From wordnet.princeton.edu, not affiliated with etymonline.