(n.) An amateur or a dabbler in an art or a field of knowledge\; especially, one who follows an art or a branch of knowledge, desultorily, or for amusement only.

Sunday painter abecedarian admirer aesthete aficionado amateur arbiter arbiter elegantiarum arbiter of taste authority bon vivant booster buff cognoscente collector connaisseur connoisseur coquet critic criticaster dabbler dabbling dabster dallier devotee dilettantish dunce epicure epicurean expert fan fancier flirt follower fool freak fribble good judge gourmand gourmet grammaticaster greenhorn greeny groupie half scholar idolater idolizer ignoramus illiterate illiterati jackleg judge know-nothing lowbrow maven middlebrow no scholar nonprofessional nut philologaster philosophaster piddler potterer puddinghead pundit putterer refined palate rooter savant scholar sciolist smatterer specialist technical expert technician tenderfoot trifler tyro unaccomplished unfinished ungifted unintelligentsia unskilled virtuoso votary worshiper