irrational, unreasonable
El sospechoso sufre un miedo irracional al agua.
The suspect has an irrational fear of water.
— Los renglones torcidos de Dios (2022)
Don't be irrational.
Es un sentimiento de odio irracional que no tiene fundamento ni justificación lógica.
It is an irrational feeling of hatred that has no basis or logical justification.
It’s absolutely irrational.
He is stupid and irrational.
She is jealous and irrational.