Found 2 items, similar to Know-it-all.
English → English (WordNet) Definition: know-it-all know-it-all n : someone who thinks he knows everything and refuses to accept advice or information from others [syn: know-all]
English → English (gcide) Definition: Know-it-all Know-it-all \Know"-it-all`\, n. One who knows everything; hence, a person who makes pretension to great knowledge, especially one whose didactic conversational habit conspicuously reveals his belief that he has superior knowledge on many subjects; a wiseacre; a know-all; -- usually ironical. [Colloq. & pejorative] Note: the use of this term implies that the speaker disapproves of this behavior, and may think that it is unjustified [1913 Webster +PJC]