1. in an extremely evil or wicked manner
2. in a manner suggesting extreme cunning or malice

Examples

• He grinned satanically as he revealed his cruel plan.
• The villain laughed satanically at his enemy’s misfortune.
• She smiled satanically, knowing she had outsmarted everyone.
• The character was portrayed as satanically clever in the story.
• His eyes gleamed satanically in the dim light.
• The plot was satanically complex, designed to deceive all involved.