Pyrrhonism, apprehension, apprehensiveness, bare suggestion, broad hint, cageyness, cast, caution, cautiousness, chariness, clue, concern, cue, dash, diffidence, disinclination to believe, distrust, distrustfulness, doubt, doubtfulness, dubiety, dubiousness, feeling, flavor, foreboding, forefeeling, funny feeling, gentle hint, gesture, gleam, glimmer, glimmering, guardedness, half-belief, half an idea, hazy idea, hesitation, hint, hunch, idea, implication, impression, incertitude, inconvincibility, incredulity, index, indication, infusion, inkling, innuendo, insinuation, intimation, intuition, intuitive impression, kick, leeriness, lick, look, mere notion, misdoubt, misgiving, mistrust, mistrustfulness, nod, notion, nudge, preapprehension, premonition, presentiment, prompt, qualm, question, resistiveness to belief, sauce, scent, scepticism, scintilla, scruple, scrupulousness, seasoning, second thoughts, self-doubt, shade, shadow, shadow of doubt, sign, signal, sip, skepticalness, skepticism, smack, smattering, smell, sneaking suspicion, soupcon, spark, spice, spoor, sprinkling, suggestion, sup, suspect, suspiciousness, symptom, tad, taint, taste, telltale, tempering, thought, tinct, tincture, tinge, tint, total skepticism, touch, tough-mindedness, trace, track, uncertainty, unconvincibility, uncredulousness, unpersuadability, unpersuasibility, vague feeling, vague idea, vestige, wariness, whiff, whisper, wink, wonder