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Definition of atheist : 1. A godless person.
2. One who disbelieves or denies the existence of a God, or supreme intelligent Being.

Synonyms:

freethinker, irreverent, irreligionist, rationalist, unorthodox, deist, unbelieving, godless, irreligious, secular, nullifidian, materialist, humanism, atheistic, atheistical, nihilist

cynic, skeptic, doubter, infidel, doubting Thomas, heathen, unbeliever, nonbeliever, heretic, pessimist, agnostic, disbeliever, dissenter

Usage examples:

• There is religion in the reverie of even an atheist; and in the meditation of a free- thinker, whose grandfather was a believer, there is almost a confession of faith. - "Bolanyo", Opie Percival Read.
• Not more than a hundred years ago the man that would not have treated him as an apostate would himself have been treated as an atheist. - "A Philosophical Dictionary, Volume 7 (of 10) From "The Works of Voltaire - A Contemporary Version"", François-Marie Arouet (AKA Voltaire) Commentator: John Morley Tobias Smollett H.G. Leigh.
• We see no good reason for abusing the atheist. - "Is The Bible Worth Reading And Other Essays", Lemuel K. Washburn.