DIABOLIC, DIABOLICAL adjective [Latin, the devil.] Devilish; pertaining to the devil; hence, extremely malicious; impious; atrocious; nefarious; outrageously wicked; partaking of any quality ascribed to the devil; as a DIABOLICAL temper; a DIABOLICAL scheme or action.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.