sneak

Describes a movement characterized by stealth, caution, and the desire to avoid detection. It implies a deliberate attempt to remain unseen or unheard, often because the person is doing something forbidden or surprising. When used as a noun for a person, it carries a strong negative connotation of dishonesty or betrayal, referring to someone who acts underhandedly or tells secrets to gain favor (similar to a 'tattletale' but with more malice). Unlike 'creep', which often suggests an unsettling or predatory vibe, 'sneak' is more neutral regarding intent—it could be a child trying to steal a cookie or a spy infiltrating a building. It focuses on the mechanics of secrecy rather than the psychological discomfort of the observer.