It's 'useless' trying to change her mind. = It's 'useless' to try to change her mind.
Drugs are 'useless' in treating the condition.
I made a 'useless' attempt at fixing the leak.
(..) I just couldn't help It. You look so natural slitting In that box. Put me behind the wheel of that bitch, I'll show you drivin'. You useless fuck. You couldn't even get your big ass in that seat. You ungrateful... Don't start with me, Hugo. Get off the damn car, this ain't your living room. (..)2003 House of 1000 Corpses