'Diabolically' definitions:

Definition of 'diabolically'

adverb

As a devil; in an evil manner; "his writing could be diabolically satiric" [syn: diabolically, devilishly, fiendishly]

From: GCIDE

Diabolic \Di`a*bol"ic\, Diabolical \Di`a*bol"ic*al\, a. [L. diabolicus, Gr. ? devilish, slanderous: cf. F. diabolique. See Devil.]
1. Pertaining to the devil; resembling, or appropriate, or appropriate to, the devil; befitting hell or satan; devilish; infernal; impious; as, a diabolic or diabolical temper or act; the diabolical expression on his face; fires lit up a diabolic scene. "Diabolic power." --Milton. "The diabolical institution." --Motley.
Syn: devilish, mephistophelian, mephistophelean. [1913 Webster]
2. showing a wicked cunning or ingenuity; as, the cold calculation and diabolic art of some statesmen.
Syn: devilish, mephistophelian, mephistophelean. [WordNet 1.5]
3. extremely evil or cruel; atrocious; outrageously wicked; as, diabolical sorcerers under the influence of devils; diabolical torturers taking pleasure in their craft.
Syn: demonic, fiendish, hellish, infernal, nefarious, satanic. [1913 Webster + WordNet 1.5] -- {Di`a*bol"ic*al*ly}, adv. -- {Di`a*bol"ic*al*ness}, n.