«زَيِّ الْهَلُوكْ لَا تِبْنْ وَلَا غَلَّهْ»

The saying likens a person to the hallūk, a harmful weed of the bean field whose exact botanical identity is uncertain. While it grows, it injures the crop it lives among, and once it dries it leaves neither fodder straw nor edible seed. It gives no return at any stage of its life.

Applied to people, it condemns someone who is useless and also actively harmful. That person contributes nothing of value and keeps causing damage or trouble for others. The sting comes from pairing those two faults: there is no benefit to set against the harm.

Say it about someone who drains or harms the people around them while giving nothing useful back. It works as a blunt verdict on that person's worth. Because it is plainly insulting, it suits frank talk among people who share the farming image rather than polite company.