WordNet sense 1 (an amateur who engages in an activity without serious intentions and who pretends to have knowledge):

dabbler, sciolist

WordNet sense 2 (showing frivolous or superficial interest; amateurish):

dilettantish, sciolistic, dilettanteish

WordNet sense 3 (being or affecting or concerned with a surface; not deep or penetrating emotionally or intellectually):

superficial