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rationaladjective having the ability to reasonhuman beings are rational creatures intelligent, reasonable, reasoning, thinking analytic(or analytical), logicalbrainy, cerebral, highbrow, highbrowed, intellectualcognitional, cognitive, mentallevelheaded, practical, sane, sensible, sober irrational, nonrational, nonthinking, unintelligent, unreasonable, unreasoning, unthinking brainless, dense, doltish, dopey(also dopy), dorky(slang), dull, dumb, fatuous, half-witted, mindless, obtuse, senseless, slow, stupid, thickheadedfallacious, groundless, illogical, invalid, nonsensical according to the rules of logicinsisted there was a rational explanation for the strange creaking noises and that there were no such things as ghosts analytic(or analytical), coherent, consequent, good, logical, reasonable, sensible, sound, valid, well-founded, well-grounded a posteriori, a priori, syllogisticcognitive, empirical(also empiric)defendable, defensible, justifiable, maintainable, supportable, sustainable, tenable illegitimate, illogical, incoherent, inconsequent, inconsequential, invalid, irrational, unreasonable, unsound, weak casuistic(or casuistical), eristic(also eristical), fallacious, misleading, sophistic(or sophistical), speciousunarticulatedunscientificabsurd, cockeyed, crazy, daffy, fatuous, half-baked, half-witted, harebrained, insane, loony(also looney), mad, nonsensical, nutty, preposterous, simpleminded, stupid, weak-minded, witlesssenseless, thoughtlessuncompelling, unconvincing based on sound reasoning or informationbetting all of your savings on the lottery is not a rational move commonsense, commonsensible, commonsensical, firm, good, hard, informed, just, justified, levelheaded, logical, reasonable, reasoned, sensible, sober, solid, valid, well-founded actual, real, truecertain, surecertified, validated, verifiedconfirmed, corroborated, substantiatedcogent, convincingcolorable, credible, plausible groundless, illogical, invalid, irrational, nonrational, nonsensical, nonvalid, unfounded, uninformed, unjustified, unreasonable, unreasoned, unsound unsubstantiated, unsupported, unwarrantedflimsy, implausible, unconvincing, weakfallacious, false, misguided, misled in the 14th century |