The term "creepy leeper" may refer to someone who constantly watches others in a disturbing or unsettling way. Some synonyms for this term include creep, pervert, stalker, voyeur, Peeping Tom, and lurker. These words all carry negative connotations and imply a level of discomfort or danger associated with someone who engages in this type of behavior. Additionally, terms such as weirdo, oddball, and eccentric may be used to describe someone who exhibits strange or abnormal behavior, although these words may not necessarily imply voyeuristic tendencies. Ultimately, it is important to recognize when someone's behavior makes us feel uncomfortable and to take appropriate measures to ensure our safety and well-being.