He is a yakuza boss.
That movie depicts a yakuza conflict.
useless; worthless; good-for-nothing
Used as an adjectival noun to describe something or someone as trashy, worthless, or of no use. Often carries a strong negative connotation.
I want to quit this worthless job.
He is a good-for-nothing person.
He joined the yakuza when he was young.
He quit the yakuza and became a law-abiding citizen.
You should quit that kind of shady work.
He continues to lead a dissolute, aimless life.