nervioso
/neɾˈbjoso/ · A2 · adj
nervous, on edge
nervioso = nervio (nerve) + -oso (-ous): nerve-ous, almost English nervous
From Latin nervosus, the same root as English nervous. The -oso ending matches English -ous (famoso/famous, curioso/curious). In Spanish it also stretches to annoyed or irritated: ponerse nervioso can mean getting worked up.