holier-than-thou

self-righteous

assured, biggety (or biggity) [Southern & Midland], bigheaded, complacent, conceited, consequential, egoistic (also egoistical), egotistic (or egotistical), important, overweening, pompous, prideful, proud, self-conceited, self-important, self-opinionated, self-satisfied, smug, stuck-up, swellheaded, vain, vainglorious

didactic, homiletic (or homiletical), moralistic, moralizing, preachy, sententious

admonishing, admonitory, cautionary

dogmatic (also dogmatical), prescriptive

highfalutin (also hifalutin), pretentious

blusterous, blustery, boastful, bombastic, braggart, bragging, braggy, cocky, swaggering

arrogant, assumptive, bumptious, cavalier, chesty, disdainful, fastuous, haughty, high-and-mighty, high-hat, huffy, lofty, lordly, masterful, peremptory, pontifical, self-asserting, self-assertive, snobbish, snobby, snooty, supercilious, superior, toplofty (also toploftical), uppish, uppity

domineering, high-handed, imperious

overconfident, presuming, presumptuous

confident, self-assured, self-confident

self-adulatory, self-congratulatory, self-contented, self-gratulatory

self-applauding, self-dramatizing, self-glorifying, self-promoting

self-affected, self-centered, self-engrossed, selfish

condescending, patronizing