Diabolic (adjective)

Extremely evil or wicked, suggestive of the devil.

Origin:

From the late latin word 'diabolicus' meaning 'devilish' which is derived from the greek word 'diabolos' meaning 'devil'.

Examples:

1. The villagers believed the mysterious stranger was a diabolic sorcerer.
2. The diabolic laughter echoed through the dark castle.
3. The diabolic plan was foiled by the brave hero.
4. The diabolic grin on the villain's face was enough to make anyone shiver.
5. Diabolic forces were thought to be behind the ancient curse.