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  1. a person who acts as though he or she knows everything and who dismisses the opinions, comments, or suggestions of others.
  1. of or characteristic of a know-it-all.

Origin of know-it-all

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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</p>

    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.

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