| unbeliever(noun, person, belief, detractor, nonconformist) |
| doubter(noun, person, belief, detractor, unbelief doubt) |
| agnostic(noun, person, irreligion, unbelieving, doubter) |
| cynic(noun, person, incredulity, unbelief doubt, unbelieving) |
| disbeliever(noun, person, unbelieving, doubter, unbeliever) |
| dissenter(noun, person, dissident, unbelieving, doubter) |
| freethinker(noun, person, radical, nonconformist, irreligion) |
| infidel(noun, adjective, person, irreligion, unbelieving) |
| heathen(noun, adjective, person, not, irreligion) |
| atheist(noun, person, irreligion, unbelieving, unbeliever) |
| heretic(noun, person, incredulity, unbelieving, doubter) |
| questioner(noun, person, detractor, cynic, unbelieving) |
| doubting thomas(noun, person, belief, detractor, unbelieving) |
| sceptic |
| latitudinarian(irreligion, doubter) |
| nonbeliever(noun, adjective, person, belief, detractor) |
| pessimist(noun, person, unbelieving, unbeliever) |
| pyrrhonist(incredulity, irreligion) |
| sceptical |
| skeptical |