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Diabolical

ˌdʌɪəˈbɒlɪkl

Diabolical definitions

adjective

Inflections:

diabolical diabolic

characteristic of the Devil, or so evil as to be suggestive of the Devil

"his diabolical cunning"

Synonyms:
devilish diabolic fiendish satanic Mephistophelian demonic demoniacal hellish infernal evil wicked ungodly unholy devilish diabolical fiendish satanic Mephistophelian demonic demoniacal hellish infernal evil wicked ungodly unholy
disgracefully bad or unpleasant

"a singer with an absolutely diabolical voice"

Synonyms:
very bad poor dreadful awful terrible frightful disgraceful shameful lamentable deplorable appalling atrocious very great extreme excessive undue inordinate immoderate unconscionable outrageous