UNREASONABLE
excessive, inordinate, undue, unreasonable
(adjective) beyond normal limits; “excessive charges”; “a book of inordinate length”; “his dress stops just short of undue elegance”; “unreasonable demands”
unreasonable
(adjective) not reasonable; not showing good judgment
Source: WordNet® 3.1
Etymology
Adjective
unreasonable (comparative more unreasonable, superlative most unreasonable)
Without the ability to reason; unreasoning.
Not reasonable; going beyond what could be expected or asked for.
Antonym: reasonable
Source: Wiktionary
Un*rea"son*a*ble, a.
Definition: Not reasonable; irrational; immoderate; exorbitant.
– Un*rea"son*a*ble*ness, n.
– Un*rea"son*a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition