Meaning of the word diabolic in English

What does diabolic mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

diabolic

US /ˌdaɪ.əˈbɑː.lɪk/
UK /ˌdaɪ.əˈbɒl.ɪk/

Adjective

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

Example:
The villain's plan was truly diabolic.
He had a diabolic grin on his face.