meaning of diabolical
Definitions for diabolical. Here are all the possible meanings and translations of the word diabolical. Princeton's WordNet(0.00 / 0 votes)Rate this definition: devilish, diabolic, diabolical, mephistophelian, mephistophelean(adj) showing the cunning or ingenuity or wickedness typical of a devil. devilish schemes; the cold calculation and diabolic art of some statesmen; the diabolical expression on his face; a mephistophelian glint in his eye.