unreasonable

[ uhn-ree-zuh-nuh-buhl, -reez-nuh- ]
/ ʌnˈri zə nə bəl, -ˈriz nə- /

adjective

not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
not in accordance with practical realities, as attitude or behavior; inappropriate: His Bohemianism was an unreasonable way of life for one so rich.
excessive, immoderate, or exorbitant; unconscionable: an unreasonable price; unreasonable demands.
not having the faculty of reason.

Origin of unreasonable

First recorded in 1300–50, unreasonable is from the Middle English word unresonabel. See un-1, reasonable

OTHER WORDS FROM unreasonable

un·rea·son·a·ble·ness, noun un·rea·son·a·bly, adverb

Example sentences from the Web for unreasonableness

British Dictionary definitions for unreasonableness

unreasonable
/ (ʌnˈriːznəbəl) /

adjective

immoderate; excessive unreasonable demands
refusing to listen to reason
lacking reason or judgment

Derived forms of unreasonable

unreasonableness, noun unreasonably, adverb