{ Di`a*bol"ic (?), Di`a*bol"ic*al
(?), } a. [L.
diabolicus, Gr. &?; devilish, slanderous: cf. F.
diabolique. See Devil.]
Pertaining to
the devil; resembling, or appropriate, or appropriate to, the devil;
devilish; infernal; impious; atrocious; nefarious; outrageously wicked; as, a
diabolic or
diabolical temper or act. "Diabolic power." Milton. "The
diabolical institution." Motley. -- Di`a*bol"ic*al*ly, adv. -- Di`a*bol"ic*al*ness, n.