1(also diabolic)Characteristic of the Devil, or so evil as to be suggestive of the Devil.
devilish, diabolic, fiendish, satanic, Mephistophelian, demonic, demoniacal, hellish, infernal, evil, wicked, ungodly, unholydevilish, diabolical, fiendish, satanic, Mephistophelian, demonic, demoniacal, hellish, infernal, evil, wicked, ungodly, unholyView synonyms
- ‘his diabolical cunning’
2British informal Disgracefully bad or unpleasant.
very bad, poor, dreadful, awful, terrible, frightful, disgraceful, shameful, lamentable, deplorable, appalling, atrociousvery great, extreme, excessive, undue, inordinate, immoderate, unconscionable, outrageousView synonyms
- ‘a singer with an absolutely diabolical voice’
Late Middle English (as diabolic): from Old French diabolique or ecclesiastical Latin diabolicus, from diabolus ‘devil’; the form diabolical dates from the early 16th century.
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