someone who has an authoritative knowledge of an art (as an appreciator and consumer rather than as a practitioner)
To become a connoisseur, you don't just need knowledge: you need a natural, inborn feel for the subject -- and this cannot be taught.
com (with)#gnoscere (recognize) (Latin)
Connoisseur is always SURE as he is an expert or a good judge (In Hindi Language) Connoisseur sounds like kaun inse sure nahi hoga, kaun nahi sure. Ye to expert hai. He is a connoisseur. He is an EXPERT.