Synonyms for "dubious": doubtful, suspicious, questionable, uncertain, unlikely, fishy, shady, iffy, debatable, equivocal, tenuous, problematic, arguable, untrustworthy, apocryphal, implausible, far-fetched, dubitable, unproven, speculative, hesitant, skeptical, wary, distrustful, chancy, risky, dicey, dangerous, perilous, hazardous, precarious, touch-and-go, shaky, fragile, flimsy, rickety, unsound, unsure, indefinite, vague, hazy, murky, opaque, ambiguous, nebulous, cloudy, dim, bleary, foggy, unclear, blurred, indistinct, faint, shadowy, ghostly, pale, wan, sickly, cadaverous, ghastly, livid, ashen, deathly, grim, somber, dismal, dreary, gloomy, bleak, drear, depressing, oppressive, heavy, suffocating, choking, stagnant, still, lifeless, inert, passive, inactive, stationary, fixed, immobile, unmoving, standing, bound, restricted, confined, limited, finite, terminal, closing, ending, winning, grasping, seizing, arresting, polluting, advertising, marketing, counseling, controlling, commanding, ruling, governing, leading, helping, backing, shielding, tracking, following, hunting, tailing, eavesdropping, tapping, attending, accommodating, yielding, caving, bowing, fawning, sucking, efficiently, effectively, swiftly, hastily, forthwith, immediately, instantly, promptly, directly, straightaway, presently, shortly, soon, anon, before long, in a minute, in a moment, in a trice, in a flash, in a heartbeat, right away, tout de suite, pronto, asap, posthaste, express, special, priority, urgent, rush, emergency, crisis, exigency, contingency, possibility, probability, likelihood, odds, chance, venture, gamble, speculation, hazard, peril, risk, danger, jeopardy, precariousness, instability, uncertainty, ambiguity, equivocation, obscurity, lividity, deathliness, depression, oppression, stagnation, inertia, passivity, stationariness, fixity, boundedness, confinedness, limitation, achievement, attainment, gain, victory, acquisition, procurement, security, snatch, grab, grasp, clutch, seizure, capture, arrest, apprehension, nab, pinch, lift, theft, robbery, burglary, plunder, pillage, ransack, loot, despoliation, desecration, pollution, contamination, taint, infection, spread, circulation, dissemination, broadcast, advertisement, promotion, publicity, sale, hawk, peddle, tout, endorsement, recommendation, advice, counsel, guidance, direction, management, control, command, rule, government, leadership, presidency, facilitation, assistance, help, aid, support, championship, defense, protection, safeguard, shield, guard, watch, observation, chase, pursuit, trail, shadow, espionage, interception, wiretap, tap, attention, heed, obedience, compliance, conformity, adaptation, adjustment, accommodation, cave-in, bow, bend, stoop, kneel, prostration, kowtow, fawn, cringe, grovel, suck, kiss, toady, truckle, subservience, flattery, adulation, sycophancy, parasitism, opportunism, expediency, pragmatism, realism, sense, rationality, logic, wisdom, prudence, care, caution, discretion, tact, diplomacy, skill, expertise, proficiency, competence, efficiency, success, triumph, winningness, prosperity, flourishing, thriving, boom, speed, haste, hurry, expedition, directness, present, anonymity, moment, jiffy, trice, twinkling, flash, heartbeat, blink, once, right, suite, urgency.