Know-it-all
[noh-it-awl] /ˈnoʊ ɪtˌɔl/
noun
1.
a person who acts as though he or she knows everything and who dismisses the opinions, comments, or suggestions of others.
adjective
2.
of or characteristic of a know-it-all.
noun
A person who pretends to virtual omniscience; bigmouth, smart-ass: Just what we need around here, another know-it-all (1895+)
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