Diabolical
/dˌaɪəˈbɑlɪkəl/
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Definition
(adj) Of or concerning the devil: devilish, satanic.
Sentence Examples
To err is human, but to persist in error is diabolical.
Sami put his diabolical plan into action.
CEFR Practice Quiz
To err is human, but to persist in error is ____.