grub

1. (of a person, behaviour) rude; harsh
   Nemoj biti tako grub prema njoj. — Don't be so rude to her.
   Odgovorio mi je grubim tonom. — He answered me in a harsh tone.
2. (of a surface, material) rough; coarse
   Ovaj džemper je od grube vune. — This sweater is made of coarse wool.
   Ruke su mu grube od rada. — His hands are rough from work.
3. (of an estimate, plan) rough; approximate
   Ovo je samo gruba procena troškova. — This is just a rough estimate of the costs.
4. (of a mistake, violation) serious; gross
   Sudija je napravio grubu grešku. — The referee made a serious mistake.

With people it is usually used with "prema": grub prema nekome.