n. 〔口语〕自称无所不知的人，知识里手；〔反意语〕万事通。 2.adj. 自称无所不知的，万事通的。
someone who thinks he knows everything and refuses to accept advice or information from others 同义词：know-all,
A know-it-all or know-all is a person who obnoxiously purports an expansive comprehension of a topic and/or situation when in reality, his/her comprehension is inaccurate or limited. This display may or may not be directly expressed.
例句与用法
1.
From his words and behaviour i know that he is a know-it-all fellow . 从他的言行，我知道他是个不学无术而喜欢吹牛皮的家伙。
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