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sceptic (n.)[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]
skepticism (n.): also scepticism, 1640s, from skeptic + -ism. Specifically regarding Christian religion, from 1800.
acatalepsy: "Unknowability, incomprehensibility, originally as a characteristic of all things, according to the ancient Sceptics. Hence also: scepticism, profession of ignorance", Mid 17th cent.; earliest use found in Gilbert Watts (d. 1657), Church of England clergyman and translator. From post-classical Latin acatalepsia from Hellenistic Greek ἀκαταληψία impossibility of direct apprehension from ancient Greek ἀκατάληπτος that cannot be reached or touched, in Hellenistic Greek also incomprehensible, not comprehending + -ία; compare -lepsy.