1. A crude, impolite, or lacking sophistication way of behaving or conducting oneself
His unrefined manner at the dinner table offended the guests.
Sua maneira grosseira à mesa de jantar ofendeu os convidados.
2. Lacking elegance, polish, or cultural refinement in one's deportment
She criticized his unrefined manner of speaking in public.
Ela criticou sua maneira grosseira de falar em público.