Pyrrhonism, apprehension, awake a doubt, be diffident, be doubtful, be dubious, be possessive, be skeptical, be uncertain, cageyness, call in question, caution, challenge, chariness, contest, diffidence, disbelief, disbelieve, discredit, dispute, distrustfulness, doubt, doubtfulness, dubiety, dubiousness, greet with skepticism, half-belief, half believe, harbor suspicions, have reservations, hesitancy, hesitation, incredulity, leeriness, misdoubt, misgive, misgiving, mistrust, mistrustfulness, qualm, query, question, raise a question, scepticism, scruple, scrupulousness, self-doubt, shadow of doubt, skepticalness, skepticism, smell a rat, suspect, suspicion, suspiciousness, throw doubt upon, total skepticism, treat with reserve, unbelieve, uncertainty, wariness