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irracional

[i.ʁa.sjɔ.ˈnaw]
adjectivepl: irracionais
irrational
1. Not based on reason or logic; lacking rational thought
His irrational fear of heights prevented him from flying.
Seu medo irracional de alturas o impediu de voar.
2. In mathematics, a number that cannot be expressed as a simple fraction
Pi is an irrational number.
Pi é um número irracional.
3. Not endowed with reason; contrary to reason
It was irrational to spend all his savings on that purchase.
Foi irracional gastar todas as suas economias naquela compra.
Synonyms
ilógicoabsurdoinsensatodesatinadoincoerente
Antonyms
racionallógicosensatorazoávelcoerente

Regional Variations

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

Related Idioms & Phrases

comportamento irracional
medo irracional
número irracional
decisão irracional
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