from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Showing wickedness typical of a devil.
- adj. Extremely evil or cruel.
from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to the devil; resembling, or appropriate, or appropriate to, the devil; befitting hell or satan; devilish; infernal; impious.
- adj. showing a wicked cunning or ingenuity.
- adj. extremely evil or cruel; atrocious; outrageously wicked.
from The Century Dictionary and Cyclopedia
- Pertaining to the devil; partaking of the qualities of the devil; devilish; hence, infernal; Impious; atrocious; outrageously wicked: as, a diabolic plot; a diabolical temper.
- Synonyms See list under devilish.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. showing the cunning or ingenuity or wickedness typical of a devil
- adj. extremely evil or cruel; expressive of cruelty or befitting hell
First attested between 1350 and 1400 from Middle English diabolik, from Middle French diabolique, from Late Latin diabolicus, from Ancient Greek διαβολικός (diabolikos, "devilish"), from διάβολος (diabolos, "devil"). (Wiktionary)