su·​per·​crim·​i·​nal
| \ ˌsü-pər-ˈkri-mə-nᵊl
, -ˈkrim-nəl\
: a very powerful and dangerous criminal
Diabolik, the original masked supercriminal of Italian comics, was created to corner a niche market: rail commuters.— Ignatiy Vishnevetsky