Sanctimonious

Definitions:

Princeton says: 

(excessively or hypocritically pious) "a sickening sanctimonious smile"

Webster says:

1

: hypocritically pious or devout <a sanctimonious moralist><the king's sanctimonious rebuke — G. B. Shaw>

2

obsolete : possessing sanctity : holy

— sanc·ti·mo·nious·ly adverb

— sanc·ti·mo·nious·ness noun

My input:

Pronunciation:  Sanc as in sanctuary. Ti as in tit, or Ti mothy. Mon sounds like moan,  rhymes with phone. I rhymes with tree. Ous sounds the same as it does in glorious. 

Webster audio

Synonyms: 

holier-than-thou, pietistic, pietistical, pharisaic, pharisaical, self-righteous

Thoughts: 

I find it interesting that the word was used to mean close to the opposite of what it does now. Lesss confusing than constellate, anyway.