IPA: //ˈsaɪəˌlɪst//
KK: /ˈsaɪəˌlɪst/
A person who claims to have knowledge or expertise but only knows a little about the subject.
Despite his confidence, he was just a sciolist who couldn't answer the most basic questions.
Sciolist → It is formed from "sciolus" (from Latin, meaning a superficial or pretentious scholar) and the suffix "-ist" (meaning one who practices or is concerned with). The word "sciolist" refers to a person who pretends to be knowledgeable but is actually superficial in their understanding.
Think of a 'pretentious scholar' ('sciolus') who is just 'playing the part' ('-ist') — that's why a sciolist is someone who acts knowledgeable without true depth.