menacingly

This adverb describes an action performed with an intent to intimidate or frighten. It carries a heavy emotional weight of aggression and impending danger, often associated with non-verbal cues like a glare, a slow approach, or a specific tone of voice. It is more intense than "threateningly," as it often implies a predatory or sinister quality to the behavior.

Because it describes the manner of an action, it is typically used to modify verbs of movement or communication. It is rarely used in casual conversation and is more common in narrative writing or formal descriptions of conflict to heighten the sense of tension and fear.