3
deist(irreligion, doubter)
3
incredulous
3
materialist(noun, person, heterodoxy, irreligion, cynic)
3
pagan(noun, person, unbelieving)
3
apostate(noun, person, unbelieving)
3
doubtful
3
dubious
3
head shaker
3
positivist(heterodoxy, irreligion)
2
doubting Thomas
2
misanthrope(noun, person, unbelieving)
2
misbeliever(noun, person, incredulity, unbelieving)
2
nihilist(noun, person, irreligion, unbelieving)
2
rationalist(noun, person, irreligion, unbelieving)
2
schismatic(noun, separatist)
2
scoffer(noun, person, unbelieving)
1
adherent
1
alien
1
cynical
1
distrustful
11 years ago|5.6k views|share |citing 
APASmart Define. (2015). skeptic thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/skeptic/thesaurus/synonyms
ChicagoSmart Define. 2015. "skeptic thesaurus" https://smartdefine.org/skeptic/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, skeptic thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/skeptic/thesaurus/synonyms>.
MLASmart Define. "skeptic thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/skeptic/thesaurus/synonyms>