nonrational

adjective

non·​ra·​tio·​nal ˌnän-ˈrash-nəl 

-ˈra-shə-nᵊl

1

: not based on, guided by, or employing reason : not rational : irrational

nonrational beliefs

nonrational behavior

… anthropological history exploring such nonrational aspects of society as mating customs and eating habits.

—Gertrude Himmelfarb

2

mathematics : not relating to or being a rational number : irrational

nonrational numbers

Synonyms

• fallacious
• illegitimate
• illogical
• inconsequent
• inconsequential
• invalid
• irrational
• unreasonable
• unreasoning
• unsound
• weak

Examples of nonrational in a Sentence

was so upset that he was completely nonrational for a moment

Word History

First Known Use

1859, in the meaning defined at sense 1