1. looking with an unpleasant, suggestive, or malicious expression
Usage: often implies inappropriate or threatening intent

1. present participle of leer; looking with an evil, unpleasant, or sexually suggestive expression
Usage: gerund form of the verb leer

Examples

• The stranger gave her a leering smile that made her uncomfortable.
• He was leering at the customers from behind the counter.
• She noticed the leering faces in the crowd and decided to leave.
• The villain’s leering expression revealed his evil intentions.
• Stop leering at people; it’s rude and inappropriate.
• His leering gaze made everyone in the room feel uneasy.
• The leering gargoyle on the building seemed to watch passersby.