defenseless(lacking any form of defense; vulnerable; open to attack) adjective [UK: də.ˈfen.sləs] [US: də.ˈfen.sləs]I'm defenseless. = Estoy indefenso.
helpless(unable to defend oneself, see also: defenseless) adjective [UK: ˈhel.pləs] [US: ˈhel.pləs]I feel helpless. = Me siento indefenso.