IPA: /ˈsuːpəˌkrɪmɪnəl/
KK: /ˈsuːpərˌkrɪmɪnəl/
A person who is exceptionally skilled or powerful in committing crimes.
The police are trying to catch the supercriminal who has evaded capture for years.
Supercriminal → It is formed from "super-" (meaning above or beyond) and "criminal" (from Latin "criminalis", meaning relating to crime). The word "supercriminal" refers to someone who is considered to be an exceptionally serious or notorious criminal, going beyond the usual level of criminality.
Think of someone who is a criminal but on a much larger scale — 'super-' means above or beyond, and 'criminal' relates to crime.