know-it-all
noun
ˈnō-ət-ˌȯl 
: one who claims to know everything
also : one who disdains advice
know-it-all adjective
Word History
First Known Use
1873, in the meaning defined above
Kids Definition
know-it-all
noun
ˈnō-ət-ˌȯl
: a person who always claims to know everything
know-it-all
noun
as in know-all
informal + disapproving a person who talks and behaves like someone who knows everything My neighbor is a real know-it-all, always telling me what to do. Synonyms & Similar Words
Relevance
- know-all
- wiseass
- wiseacre
- wisenheimer
- smarty
- smarty-pants
- wise guy
- smartie
- smart aleck
- hotshot
- wisecracker
- weisenheimer
- show-off
