useless
US /ˈjuːs.ləs/
UK /ˈjuːs.ləs/

1.
inútil, inservible
serving no purpose; completely without use
:
•
This broken pen is completely useless.
Este bolígrafo roto es completamente inútil.
•
It's useless to argue with him; he never changes his mind.
Es inútil discutir con él; nunca cambia de opinión.
2.
incapaz, inepto
having no ability or skill in a particular area
:
•
I'm completely useless at math.
Soy completamente inútil para las matemáticas.
•
He's useless with computers.
Es inútil con las computadoras.