Rational
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ignorant, unthinking, unstable, misleading, implausible, preposterous, specious, unconvincing, insane, thoughtless, unarticulated, silly, invalid, unscientific, ridiculous, simple, unjustified, careless, unrealistic, unbalanced, agitated, stupid, unsystematic, casuistic, unwise, misguided, nonintellectual, irrational, unintelligent, senseless, loony, excited, Eristic, unreasonable, uninformed, groundless, uncompelling, unsound, Unreasoned, sophistic, confused, nonthinking, sottish, undiscerning, futile, idiotic, nonsensical, illogical, flimsy, foolish, physical, obtuse.