diabolically
adverb
UK/ˌdaɪ.əˈbɒl.ɪ.kᵊl.i/
US/ˌdaɪ.əˈbɑː.lɪ.kᵊl.i/
Definitions of diabolically adverb
in an extremely evil, wicked, or shocking manner
His plan was diabolically evil.
The plot of the film was diabolically terrifying.
The task was diabolically difficult.