What is a Know-It-All?
A know-it-all is someone who thinks they know everything and refuses to accept advice or information from others. They are often characterized by their overconfidence and self-centeredness. They may be difficult to be around because of their refusal to listen to other people’s opinions and ideas.
Definitions of Know-It-All
- Know-it-all: someone who thinks he knows everything and refuses to accept advice or information from others.
- Synonyms: know-all.
- Type of: egoist, egotist, swellhead.
- Description: a conceited and self-centered person.

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