| atheist(noun, person, view, disbelieve, irreligion) |
| skeptic(noun, person, belief, detractor, nonconformist) |
| agnostic(noun, irreligion, cynic, unbelieving, questioner) |
| heretic(noun, radical, revolutionary, nonconformist, incredulity) |
| cynic(noun, radical, revolutionary, detractor, incredulity) |
| doubter(noun, person, belief, detractor, unbelief doubt) |
| infidel(noun, irreligion, nonbeliever) |
| disbeliever |
| heathen(noun, irreligion) |
| nonbeliever(noun, person, belief, radical, revolutionary) |
| pagan(noun, adjective, person) |
| apostate |
| dissenter(noun, radical, revolutionary, nonconformist, subversive) |
| sceptic(noun, radical, revolutionary, critic, detractor) |
| freethinker(noun, nonconformist, irreligion, separatist, cynic) |
| nullifidian |
| doubting Thomas(noun, person, belief, detractor, cynic) |
| Gentile(noun, irreligion) |
| materialist(noun, irreligion, cynic, unbelieving, questioner) |
| misbeliever |