irrational.
Not rational; unfounded, nonsensical or wrong-headed.
Meaning & usage
Not rational; unfounded, nonsensical or wrong-headed.
an irrational decision
Of a real number, that cannot be written as the ratio of two integers.
The number π is irrational.
Where this word comes from
From Latin irratiōnālis, from ir- + ratiōnālis.
A real number that can not be expressed as the quotient of two integers, an irrational number.
Where this word comes from
From Latin irratiōnālis, from ir- + ratiōnālis.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.