Definition of unreasonal in English:

unreasonal

adjective

US
rare
  • Not reasonable.

Origin

Mid 17th century; earliest use found in Marchamont Nedham (bap. 1620, d. 1678), journalist and pamphleteer. From un- + reasonal.

Pronunciation

unreasonal

/(ˌ)ʌnˈriːz(ə)n(ə)l//(ˌ)ʌnˈriːz(ə)n(ə)l/