Relating to or characteristic of Satan or the worship of Satan.
The word 'satanical' has a very bad and scary feeling. It is usually connected to evil things.
Examples:
The witches performed a satanical ritual.
He wore a satanical costume for Halloween.
The satanical symbols were painted on the wall.
The cat's eyes looked satanical in the dark.
The satanical music made everyone feel scared.
The satanical laughter echoed through the old house.