know-it-all
(chiefly, US, pejorative) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc.
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(chiefly, US, pejorative) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.
We had it all figured out, but this know-it-all marched in with "the correct way of solving it", leaving our experiment in shambles.
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- know-all89%
(chiefly, UK, Ireland) Someone who obnoxiously claims to be knowledgeable on a subject.
- knowledgeable64%
Having knowledge, especially of a particular subject.
- knowledgeable62%
(India) A person who has knowledge; an informed party.
- know one's shit60%
(slang, vulgar, idiomatic) , to be knowledgeable about a subject or task.
- intellectualoid58%
(US, derogatory) One with intellectual pretensions.