know-it-all

n. Informal
One who claims to know everything and rejects advice or information from others.

know-it-all know'-it-all' adj.

noun

One who is obnoxiously self-assertive and arrogant: malapert, witling. Informal saucebox, smart aleck, smarty, smarty-pants, wisenheimer. Slang wiseacre, wisecracker, wise guy. See good/bad.

IN BRIEF: n. - Someone who thinks he understands everything and refuses to accept advice or information from others.

Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: (informal) someone who thinks he knows everything and refuses to accept advice or information from others
  Synonym: know-it-all

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Dansk (Danish)
n. - bedrevidende person, blærerøv, vigtigper

Français (French)
n. - (Monsieur) je-sais-tout, (Madame ou Mademoiselle) je-sais-tout

Deutsch (German)
n. - Besserwisser

Ελληνική (Greek)
n. - εξυπνάκιας, παντογνώστης

Italiano (Italian)
sputasenno

Português (Portuguese)
n. - sabichão (m), bidu (m) (f)

Русский (Russian)
всезнайка

Español (Spanish)
n. - sabelotodo, sabihondo

Svenska (Swedish)
n. - besserwisser, allvetare

中文（简体）(Chinese (Simplified))
假装或自称无所不知的人

中文（繁體）(Chinese (Traditional))
n. - 假裝或自稱無所不知的人

한국어 (Korean)
n. - 아는 체 하는 사람

日本語 (Japanese)
n. - 物知り, 物知りぶった人

עברית (Hebrew)
n. - ‮יודע-כל (כביכול), ידען (כביכול)‬

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