Know-it-all Definition

nōĭt-ôl
know-it-alls
noun
One who claims to know everything and rejects others' advice or information.
American Heritage
A know-it-all person.
Webster's New World
(pejorative) Someone who obnoxiously claims to be knowledgeable on a subject.
We had it all figured out, but this know-it-all marched in with "the correct way of solving it", leaving our experiment in shambles.
Wiktionary
adjective
Pretending or claiming to know much about almost everything.
Webster's New World

Other Word Forms of Know-it-all

Noun

Singular:
know-it-all
Plural:
know-it-alls
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