Word Type

Noun

Adjective

Adjective

The word "irrational" can be used as noun, adjective and adjective.

Word Relationships

Opposites (Antonyms)

rational rational

Derived Terms

irrational number irrationalism irrationalist irrationalistic irrationality irrationalization irrationalize irrationally irrationalness nonirrational

Context

arithmetic mathematics number theory

Broader Terms (Hypernyms)

real real number

Related Terms

illogical incoherent integer irrational number nonsensical rational real number unfounded unreasonable

Similar Terms

blind illogical incoherent insane nonrational nonrational reasonless reasonless superstitious superstitious unlogical unreasonable unreasoning unreasoning

Synonym Network

irrational number unreasonable

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