Pyrrhonic, agnostic, ambiguous, capricious, chancy, changeable, dicey, distrustful, doubtful, dubious, equivocal, erratic, fickle, from Missouri, hesitant, hesitating, in doubt, incalculable, indecisive, indemonstrable, irresolute, leery, mistrustful, mistrusting, polysemous, questioning, scrupulous, shy, skeptical, suspecting, suspicious, touch-and-go, unaccountable, uncertain, unconfirmable, unconvinced, undivinable, unforeseeable, unpersuaded, unpredictable, unprovable, unsure, untrusting, unverifiable, variable, wary, wavering, whimsical