Adjective: diabolical ,dI-u'bó-li-kul
- Showing the cunning, ingenuity or wickedness typical of a devil
"the diabolical expression on his face";
- devilish, diabolic, mephistophelian, mephistophelean
- Extremely evil or cruel; expressive of cruelty or befitting hell
"diabolical sorcerers under the influence of devils";
- demonic, diabolic, fiendish, hellish, infernal, satanic, unholy, satanical [rare]
See also: evil
Encyclopedia: Diabolical