This is the 11009th most frequent Portuguese word.
irracional
Not logical or reasonable; irrational.
Here, 'irracional' is used to describe behavior that lacks logic or reason.
Seu comportamento é completamente irracional.
His behavior is completely irrational.
In this sentence, 'irracional' is used to describe fear based on unfounded or unrealistic premises.
É irracional temer algo que não existe.
It is irrational to fear something that does not exist.
The word 'irracional' here describes animals that are not endowed with rational thinking, distinguishing them from humans.