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A scary voice is typically characterized by a low, gruff tone and slow, deliberate speech that conveys a sense of menace or danger. The voice may also be guttural, grating, or snarling, with a rough, gravelly quality that adds to its terror-inducing effect. Inflections of anger, rage, or insanity further enhance the fear factor. Modulation and rhythm are also important: scary voices often speak in a low, growling whisper that is both unsettling and unpredictable.