1. in a frightening or eerie manner; in a way that suggests the presence of ghosts or supernatural forces

Examples

• The old house creaked spookily in the wind.
• The fog rolled in spookily across the cemetery.
• Her voice echoed spookily through the empty hallway.
• The shadows moved spookily across the wall.
• The abandoned playground looked spookily quiet at night.
• The music box played spookily by itself.