(a.) Not reasonable; irrational; immoderate; exorbitant.

a bit much abandoned absonant absurd arbitrary bigoted blind boundless brainless capricious contradictory contrary to reason cranky crazy crotchety cutthroat egregious enormous exacting exaggerated excessive exorbitant extortionate extravagant extreme extremist fabulous fallacious fanatic fanciful fancy fantasied fantastic fatuous faulty flaky flawed foolish freakish gigantic gluttonous gouging grossly overpriced haggard harebrained high humorsome hyperbolic hypertrophied idiotic ill-advised ill-considered ill-contrived ill-devised ill-gauged ill-judged illogical imbecilic immoderate impolitic impractical improper imprudent inadvisable inappropriate inapt inauthentic inconclusive incongruous inconsequent inconsequential inconsiderate inconsistent incontinent indefensible indiscreet inequitable inexcusable inexpedient inexpiable inflationary injudicious inordinate insane insensate intemperate invalid irrational irremissible kinky laughable loose ludicrous mad maggoty mindless misadvised misguided monstrous moody moronic motiveless myopic nonrational nonscientific nonsensical not following notional out of bounds out of sight outrageous overbig overdeveloped overenthusiastic overgreat overgrown overlarge overmuch overpriced overreligious overweening overzealous paralogical peremptory perfervid petulant preposterous prohibitive quirky rabid reasonless reckless ridiculous self-annulling self-contradictory self-refuting senseless short-sighted shortsighted silly skyrocketing sophistic spiraling steep stiff stupid temperamental thoughtless too much ultrazealous unadvised unallowable unapt unauthentic unbefitting unbridled uncalled-for unconnected unconscionable unconsidered undiscerning undue unequal unfair unforeseeing unforgivable unjust unjustifiable unjustified unlawful unpardonable unperceiving unperceptive unphilosophical unrealistic unreflecting unreflective unrestrained unscientific unseeing unsensible unsound unsuitable unthinking unthoughtful unwarrantable unwarranted unwise usurious vagarious vagrant wanton wayward whimsical wild-eyed wild-looking without reason witless wrongful zealotic