I don't know, am unaware of
Desconozco los detalles, pero está muerto.
I don't know the details, but he's dead.
— Solaris (1972)
Hay muchas palabras cuyo significado desconozco.
There are many words whose meaning I don't know.
I don't know the meaning.
I don't know the details.
Desconozco esta parte de la ciudad.
I don't know this part of the city.
Desconozco dónde está Tom.
I don't know where Tom is.
I don't know what motivates them.
Desconozco si Tom va a nadar o no.
I don't know whether Tom is going swimming or not.