sceptic (n.)youdaoicibaDictYouDict[sceptic 词源字典]
chiefly British English spelling of skeptic (q.v.). Related: Sceptical; sceptically; scepticism.[sceptic etymology, sceptic origin, 英语词源]
skeptical (adj.)youdaoicibaDictYouDict
also sceptical, 1630s; see skeptic + -al (1). Related: Skeptically.
doubting ThomasyoudaoicibaDictYouDict
"A person who is sceptical and refuses to believe something without proof", Early 17th century: with biblical allusion to the apostle Thomas (John 20:24–29).