noun
someone who thinks he knows everything and refuses to accept advice or information from others
• Syn: ↑know-all
• Usage Domain: ↑colloquialism
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I. \\ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷\ noun also know-all \\ˈ ̷ ̷ˌ ̷ ̷\ (plural know-it-alls also know-alls) : one that rashly and annoyingly claims to know or acts as if knowing all about everything or nearly everything : one to whom nothing new can apparently be told or who views any advice or suggestion from others as of little or no value or as something that had already been considered and acted on or rejected
loud cocky know-it-alls
a humbling enigma for the know-alls — D.B.W.Lewis
Etymology: know-it-all (I), know-all
: of, relating to, or having the characteristics of a know-it-all
a know-it-all attitude
a know-all manner
should not be so know-it-all about what the Almighty was up to — Gretchen Finletter
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/noh"it awl'/, n.
1. a person who acts as though he or she knows everything and who dismisses the opinions, comments, or suggestions of others.
adj.
2. of or characteristic of a know-it-all.
[1930-35]
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a know-all
Thesaurus: people who are confident, boastful or arrogantsynonym people who are annoying or unpleasantsynonym
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know-it-all «NOH iht L», noun, adjective. U.S. Slang.
–n.
a person with pretensions to complete or infallible knowledge: »
The blasé know-it-all from the large prep school is cynically scornful (New York Times).
–adj.
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n. informal a person who behaves as if they know everything
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/ˈnowətˌɑːl/ noun, pl -alls [count]
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.
— often used before another noun
my know-it-all neighbor
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ˈknow-it-all [know-it-all know-it-alls] (especially NAmE) (BrE also ˈknow-all) noun (informal, disapproving)
a person who behaves as if they know everything
See also: ↑know-all
Useful english dictionary. 2012.