Definition of: skeptic

(skep′tik) noun
1. One who questions the fundamental doctrines of religion, especially of the Christian religion.
2. One who refuses concurrence in generally accepted conclusions in science, philosophy, etc.
3. An adherent of any philosophical school of skepticism; especially, an adherent of the Skeptic school in ancient Greece, of which the Pyrrhonists, with their doctrine of the relativity of knowledge, were the first systematic exponents.
4. One who doubts any particular statement.
—adjective Skeptical. Also, Brit., sceptic. [<F sceptique <L scepticus <Gk. skeptikos reflective <skeptesthai consider] Synonyms (noun): agnostic, atheist, deist, disbeliever, freethinker, infidel, unbeliever. 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 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. Antonyms: believer, Christian.