What term best describes the action of peeping into windows without consent?

The term that best describes the action of peeping into windows without consent is prowling. Prowling involves moving around stealthily with the intention of committing a crime or observing something without the knowledge or awareness of others, which aligns perfectly with the act of peeping. It indicates an intent that raises suspicion regarding a person's actions and purposes.

Loitering refers more to remaining in a particular public place for an extended period without a clear purpose, while disturbing the peace generally involves actions that disrupt public tranquility. Unlawful fighting pertains specifically to engaging in a physical confrontation in an unlawful manner. Given these distinctions, prowling is the most appropriate term to encompass the behavior of secretly observing someone through a window without their permission.