Fallacious — Meaning, Definition & Synonyms

Fallacious (adjective) — Senses, Synonyms & Antonyms

1. not using or following good reasoning

   "it's fallacious to say that something must exist because science hasn't proven its nonexistence"

   similar: illegitimate, illogical, inconsequent, inconsequential, invalid, irrational, nonrational, unreasonable, unreasoning, unsound, weak
   related: eristic, misleading, sophistic, specious, half-baked, ill-advised, misguided, unconsidered, unreasoned, inconsistent, absurd, asinine, foolish, meaningless, nonsensical, preposterous, reasonless, senseless, silly, Kafkaesque, odd, peculiar, strange, surreal, unusual, weird, insane, mad, nutty, wacky, disordered, disorganized, rambling, random, unconvincing, inexplicable, unaccountable, unexplainable
   opposite: logical, rational, reasonable, sound, valid, well-founded, well-grounded
   near: commonsense, sane, sensible, sober, wise, enlightened, informed, just, justified, reasoned, ordered, organized, clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid, certain, sure, true, confirmed, corroborated, demonstrated, established, substantiated, validated

2. tending or having power to deceive

   "consumers who harbor the fallacious belief that credit-card spending will never catch up with them"

   similar: beguiling, deceitful, deceiving, deceptive, deluding, delusive, delusory, false, misleading, specious
   related: artful, crafty, cunning, devious, foxy, guileful, shady, shifty, slick, sly, sneaking, sneaky, subtile, subtle, trick, trickish, tricky, underhand, underhanded, wily, inaccurate, incorrect, wrong, bewildering, confounding, distracting, perplexing, puzzling, ambidextrous, crooked, defrauding, dishonest, dissembling, double-dealing, duplicitous, faithless, fast, fraudulent, knavish, lying, mendacious, untrustworthy, untruthful, bogus, counterfeit, fake, feigned, forged, jive (slang), phony, sham, spurious, insidious, perfidious, treacherous, ambiguous, circuitous, equivocal, evasive, artificial, backhanded, hypocritical, insincere, left-handed, two-faced
   opposite: aboveboard, forthright, nondeceptive, straightforward
   near: candid, direct, foursquare, frank, free-spoken, open, openhearted, outspoken, plain, plainspoken, straight, clarifying, elucidative, explanatory, illuminating, revealing, revelatory, honest, trustworthy, truthful