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Are there english words for a person who sincerely thinks of him as an expert but in reality (by common standards) is not?
Source: Recently, in my native place, a very popular movie actor (let us say his name is extrem) started a music band and held a live show during a government sponsored program which was widely criticized and made fun of. Nowadays, if someone claims to be something he is not, the media refers to it as extremism jokingly.
Maybe you would call such a person a dilettante -- one "whose interest in an art or in an area of knowledge is not very deep or serious."
It is nowadays a bit dated to call someone a a big head, but that probably sums up what you are looking for, better than anything.
