diabolical

dia|boli|cal /d'aɪəb'ɒlɪkəl/
[ADJ]
If you describe something as diabolical, you are emphasizing that it is very bad, extreme, or unpleasant. (INFORMAL)
It was a diabolical error, a schoolboy error...
= appalling
diabolically [ADV]
...diabolically difficult clues.

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