Word Type

Adjective

Adjective

The word "unreasonable" can be used as adjective and adjective.

Word Relationships

Opposites (Antonyms)

reasonable reasonable

Derived Terms

Wednesbury unreasonable unreasonableness unreasonably

Related Terms

illogical immoderate irrational reason reasonable unreasoning

Similar Terms

counterintuitive counterintuitive illogical immoderate indefensible indefensible insane irrational mindless reasonless reasonless senseless undue unjustified unjustified unlogical untenable unwarranted

Synonym Network

inordinate irrational

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.