1 a person who has no religious belief; unbeliever
2 rejecting a specific religion, esp. Christianity or Islam
3 of, characteristic of, or relating to unbelievers or unbelief
(C15: from Medieval Latin infidelis, from Latin (adj): unfaithful, from in-1 + fidelis faithful; see feal)
English Collins Dictionary - English Definition & Thesaurus
atheist, freethinker, Gentile, giaour (Turkish) heathen, heretic, pagan, sceptic, unbeliever
English Collins Dictionary - English synonyms & Thesaurus
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