What is another word for "doubt"?

Roget's Thesaurus (1911) lists these synonyms for "doubt": agnostic, agnosticism, alien, all, aloof, and, antichristian, antichristianity, any, atheism, atheist, atheistic, awful, belief, believe, better, bout, carnal, could, cynic, cynical, cynicism, dead, deaf, deathlike, dechristianize, deism, deist, deistical, devoutless, disbelief, disbelieve, disposed, distrust, distrustful, drop, ear, earthly, est, faint.