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[noh-it-awl] /ˈnoʊ ɪtˌɔl/
a person who acts as though he or she knows everything and who dismisses the opinions, comments, or suggestions of others.
of or characteristic of a know-it-all.
Origin of know-it-all
First recorded in 1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for know-it-all
Contemporary Examples
Historical Examples
  • "She is—and she's just what you need," said Sue, with that know-it-all smile of hers.

    The Harbor Ernest Poole
  • Lewis was one of these stuck-up, know-it-all johnnies, not long breeched.

    Two on the Trail

    Hulbert Footner
  • He is impressed with the suggestion that the speaker is a "know-it-all" fellow.

    Certain Success Norval A. Hawkins
  • He must keep in sympathetic touch with the new, damning the know-it-all frame of mind.

  • None of the new girls appeared to be inclined toward a “know-it-all” attitude, for which Jane was grateful.

Slang definitions & phrases for know-it-all



A person who pretends to virtual omniscience; bigmouth, smart-ass: Just what we need around here, another know-it-all (1895+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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