is unable to
Todo aquel que es incapaz de aprender se ha dado a enseñar.
Anyone who is incapable of learning has taken to teaching.
He is incapable of doing that.
Ese chico es incapaz de prepararse un huevo.
That boy is incapable of preparing an egg for himself.
— Taxi Express (1998)
She is incapable of deceiving.
Parece obvio que él es incapaz de nadar.
It seems obvious that he is unable to swim.
Él es incapaz de decir una mentira.
He is incapable of telling a lie.
Tom es incapaz de perder.
Tom is incapable of losing.
Es incapaz de copiar en un examen.
He is incapable of cheating on an exam.
Un bebé es incapaz de cuidar de sí mismo.
A baby is incapable of taking care of itself.
He is incapable of doing it.