Skeptic, n.
Etymology: [Gr. skeptikos thoughtful, reflective, fr. skeptesqai to look carefully or about, to view, consider: cf. L. scepticus, F. sceptique. See Scope.]
[Written also sceptic.]
1. One who is yet undecided as to what is true; one who is looking or inquiring for what is true; an inquirer after facts or reasons.
2. (Metaph.)
A doubter as to whether any fact or truth can be certainly known; a universal doubter; a Pyrrhonist; hence, in modern usage, occasionally, a person who questions whether any truth or fact can be established on philosophical grounds; sometimes, a critical inquirer, in opposition to a dogmatist. All this criticism [of Hume] proceeds upon the erroneous hypothesis that he was a dogmatist. He was a skeptic; that is, he accepted the principles asserted by the prevailing dogmatism: and only showed that such and such conclusions were, on these principles, inevitable. Sir W. Hamilton.
4 more senses
3. (Theol.)
A person who doubts the existence and perfections of God, or the truth of revelation; one who disbelieves the divine origin of the Christian religion. Suffer not your faith to be shaken by the sophistries of skeptics. S. Clarke.
Note: This word and its derivatives are often written with c instead of k in the first syllable, -- sceptic, sceptical, scepticism, etc. Dr. Johnson, struck with the extraordinary irregularity of giving c its hard sound before e, altered the spelling, and his example has been followed by most of the lexicographers who have succeeded him; yet the prevalent practice among English writers and printers is in favor of the other mode. In the United States this practice is reversed, a large and increasing majority of educated persons preferring the orthography which is most in accordance with etymology and analogy.
Syn. -- Infidel; unbeliever; doubter. -- See Infidel.
1 other Webster entry under this spelling
Skeptic, Skeptical, a.
1. Of or pertaining to a sceptic or skepticism; characterized by skepticism; hesitating to admit the certainly of doctrines or principles; doubting of everything.
2. (Theol.)
Doubting or denying the truth of revelation, or the sacred Scriptures. The skeptical system subverts the whole foundation of morals. R. Hall. -- Skep"tac*al*ly, adv. -- Skep"tic*al*ness, n.
Shades of meaning
The skeptic doubts divine revelation; the disbeliever and the unbeliever reject it, the disbeliever with more of intellectual dissent, the unbeliever (in the common acceptation) with indifference or with opposition of heart as well as of intellect. Infidel is an opprobrious term that might once almost have been said to be geographical in its range. The Crusaders called all Mohammedans infidels, and were so called by them in return; the word is commonly applied to any decided opponent of an accepted religion. The atheist denies that there is a God; the deist admits the existence of God, but denies that the Christian Scriptures are a revelation from him; the agnostic denies either that we do know or that we can know whether there is a God.