Causing an unpleasant feeling of fear or unease. The old, abandoned house at the end of the street had a creepy atmosphere.
Strangely unpleasant or unsettling, often in a way that suggests something sinister. There was a creepy silence in the empty corridor that made her skin crawl.
Describing a person who makes others feel uncomfortable or distrustful, often because their behaviour seems sinister or socially inappropriate. The new supervisor was friendly to everyone, but his constant, silent staring was downright creepy.