1. the quality of being threatening or suggesting evil or harm

Examples

• The sinisterness of his smile made everyone uncomfortable.
• There was a certain sinisterness about the abandoned house.
• The movie’s atmosphere was enhanced by the sinisterness of the villain’s laugh.
• She couldn’t shake the feeling of sinisterness that surrounded the old cemetery.
• The sinisterness in his voice warned her to stay away.
• Despite its beauty, the forest had an underlying sinisterness that frightened hikers.