'Know-it-all' definitions:
Definition of 'know-it-all'
From: WordNet
noun
Someone who thinks he knows everything and refuses to accept advice or information from others [syn: know-it- all, know-all]
Definition of 'Know-it-all'
From: GCIDE
- 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]
Synonyms of 'know-it-all'
From: Moby Thesaurus
- aggressively self-confident,
- biggety,
- braggart,
- bumptious,
- chesty,
- cocky,
- conceited,
- egocentric,
- egoist,
- egotist,
- immodest,
- individualist,
- narcissist,
- Narcissus,
- narcist,
- no modest violet,
- obtrusive,
- overwise,
- peacockish,
- peacocky,
- perk,
- perky,
- pert,
- puffed up,
- self-conceited,
- self-opinionated,
- smart aleck,
- smart-alecky,
- smarty,
- smarty-pants,
- stuck-up,
- swelled-headed,
- swellhead,
- wise guy,
- wiseacre,
- wisecracker,
- wisehead,
- wisenheimer