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

Antonyms

Regional Variations

General Brazilian

irracional

Standard usage across Brazil

Portugal

irracional

Standard usage in Portugal

irrational exuberance - exuberance irracional (excessive optimism without basis)

irrational actor - ator irracional (unpredictable person or entity)

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