Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.
Class VI. Words Relating to the Sentient and Moral PowersSection V. Religious Affections
3. Religious Sentiments
989. Irreligion.
SKEPTICISM, doubt; unbelief, disbelief, incredulity, incredulousness &c. adj.; want of -faith, – belief; pyrrhonism; doubt [See Unbelief. Doubt]; agnosticism, freethinking; deism; hylotheism; materialism, rationalism, positivism; nihilism.
INFIDELITY, antichristianity, antichristianism, atheism.
UNBELIEVER, infidel, atheist, antichristian; giaour [Turk.], heretic, miscreant [archaic], heathen, alien, gentile, Nazarene; esprit fort [F.], freethinker, skeptic, pyrrhonist, deist, latitudinarian, rationalist; materialist, positivist, nihilist, agnostic, somatist, theophobist.
dechristianize, antichristianize [rare]; serve Mammon, contend against the light, love darkness rather than light, deny the truth.
SKEPTICAL, freethinking, unbelieving, unconverted; incredulous, faithless, lacking faith; deistic, deistical; antichristian, unchristian.
WORLDLY, mundane, earthly, carnal; worldly &c. worldly-minded, unspiritual.