transcription, транскрипция: [ daɪəbɒlɪk(ə)l ]
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
ADJ [ emphasis ]
• dia‧boli‧cal‧ly
...diabolically difficult clues.
ADV