Definition of know-it-all
Know-it-all: one who claims to know everything Also: one who disdains advice
Smart aleck, wise guy, wiseacre, wisenheimer, smarty pants.
Examples of ‘know-it-all’ in a sentence
- His reputation as an autocratic know-it-all goes before him.
- Do not force your opinions on others and definitely do not come across as a know-it-all.
- Dad was never a know-it-all, he just wanted me to improve my game.