Can refer to someone who is out of their mind or in a state of delirium.
Después de días de fiebre, se encontraba delirado y confundido en la cama.
After days of fever, he was delirious and confused in bed.
El delirado hombre hablaba incoherencias, lo que preocupaba a quienes lo rodeaban.
The delirious man spoke incoherently, which worried those around him.