Behaving with sanctimony:
Sanctimonious or self-righteous to an annoying degree; priggish
Of or concerned with the judgment of right or wrong of human action and character:
Used or intended for teaching or instruction
Inclined to teach or moralize excessively
Giving or containing monition; admonishing
The definition of sententious is language that is short on words, and contains a lot of moralizing.
Find another word for preachy. In this page you can discover 19 synonyms, antonyms, idiomatic expressions, and related words for preachy, like: moralizing, pontifical, pretentious, condescending, self-indulgent, sanctimonious, holier-than-thou, moral, didactic, didactical and teach.