What is the opposite of 'reasonable'?

Antonyms for REASONABLE: illegitimate, illogical, incoherent, inconsequent, inconsequential, invalid, irrational, unreasonable, unsound, weak, groundless, illogical, invalid, irrational, nonrational, nonsensical, nonvalid, unfounded, uninformed, unjustified, unreasonable, unreasoned, unsound, costly, dear, deluxe, expensive, high, high-ticket, precious, premium, pricey, pricy, spendy, valuable, irrational, nonrational, nonthinking, unintelligent, unreasonable, unreasoning, unthinking, etc.

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