unbelieving

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

1. adjective

   rejecting any belief in gods
   synonyms: atheistic, atheistical

   irreligious

   hostile or indifferent to religion
2. adjective

   denying or questioning the tenets of especially a religion
   synonyms: disbelieving, sceptical, skeptical

   incredulous

   not disposed or willing to believe; unbelieving
3. adjective

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

   agnostic, agnostical

   uncertain of all claims to knowledge