A person who's unbelieving denies or doubts the truth of something. Your religious grandmother might invite her unbelieving friend to come with her to church.

Being unbelieving often has to do with a lack of religious beliefs. Another way to be unbelieving is to be incredulous, or astonished by something — so amazed that you can't believe what you're seeing or experiencing. The best part about performing magic tricks for little kids is the unbelieving expressions on their faces when they see a rabbit appear in a hat or a bouquet of flowers suddenly vanish.

Definitions of unbelieving

adj rejecting any belief in gods

atheistic, atheistical
hostile or indifferent to religion

adj denying or questioning the tenets of especially a religion

disbelieving, sceptical, skeptical
not disposed or willing to believe; unbelieving

adj holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible

agnostic, agnostical
uncertain of all claims to knowledge

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