Etymology
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sanctimonious (adj.)

c. 1600 (in "Measure for Measure," with the disparaging sense "making a show of sanctity, affecting an appearance of holiness"), from sanctimony + -ous. The un-ironic, literal sense is about as old in English and was used occasionally from c. 1600 to c. 1800. Related: Sanctimoniously; sanctimoniousness.

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Definitions of sanctimonious

sanctimonious (adj.)
excessively or hypocritically pious;
a sickening sanctimonious smile
Synonyms: holier-than-thou / pietistic / pietistical / pharisaic / pharisaical / self-righteous
From wordnet.princeton.edu