One who is obnoxiously self-assertive and arrogant
He is effete, pompous, infuriatingly know-it-all, and a welcome addition to any Star Trek plotline.
"It's a skip case," DeLeo said with a know-it-all air that defied anyone to doubt him.
Bork had proved to be his own worst enemy on television, creating an impression of an arrogant know-it-all spouting reactionary bromides.
know-it-all critics and people such as myself constantly pecking away at you.