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irrational

[/ɪˈræʃənəl/]
adjective
irracional
1. not based on or guided by reason or logic
His irrational fear of heights prevented him from flying.
Seu medo irracional de alturas o impediu de voar.
2. not endowed with reason or understanding
Irrational animals rely on instinct rather than logic.
Os animais irracionais dependem do instinto em vez da lógica.
3. (mathematics) of a number that cannot be expressed as a simple fraction; not rational
Pi is an irrational number.
Pi é um número irracional.
Synonyms
illogicalunreasonableabsurdsenselesscrazyinsensible
Antonyms
rationallogicalreasonablesensiblewise

Regional Variations

General Brazilian
irracional
Standard usage across Brazil
Portugal
irracional
Standard usage in Portugal

Related Idioms & Phrases

irrational exuberance - exuberance irracional (excessive optimism without basis)
irrational actor - ator irracional (unpredictable person or entity)
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