doubt

abroad, adrift, afraid to say, ambiguous, ancipitous, apocryphal, astray, at a loss, at a nonplus, at fault, at one's wit's end, at sea, casual, changeable, confused, contingent, contingent on, controvertible, debatable, deceptive, dependent on, dependent on circumstances, disputable, distracted, distraught, distrustful of, doubtful, doubting, dubious, enigmatic, equivocal, evasive, experimental, fallacious, fallible, false, fine-spun, hard to believe, hypothetical, ignorant, illusive, illusory, in a cloud, in a maze, in a state of uncertainty, in question, in suspense, inconceivable, incredible, incredulous as to, indecisive, indefinite, indeterminate, jesuitical, lost, mebby-scales, minimifidian, mystic, not to be believed, occasional, open to discussion, open to doubt, open to suspicion, oracular, out of one's reckoning, overrefined, paradoxical, perplexing, pettifogging, plausible, plausive, precarious, problematical, puzzled, questionable, quibbling, shy of, skeptical as to, slippery, sophistical, specious, staggering, subject to, suspect, suspicious, suspicious of, ticklish, unascertained, unauthentic, unauthenticated, unauthoritative, unbelieving, uncertain, unconfirmed, uncounted, undecided, undefinable, undefined, undemonstrable, undemonstrated, undeserving of belief, undetermined, unreliable, unsettled, untold, untrustworthy, unworthy of belief, vague