Synonyms of 'disbeliever'
their attempts to convert disbelievers to their faith
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An agnostic believes that it is not possible to know whether God exists or not. Compare atheist.
He was, if not an atheist, an agnostic.
An atheist is a person who believes that there is no God. Compare agnostic.
She is an ex-nun who is now an atheist.
Thesaurus for disbeliever from the Collins English Thesaurus