Is it true sign of a bad temper from mono brow?

The idea that a unibrow is a sign of a bad temper is a stereotype and not scientifically supported. Physical features, like a unibrow, do not determine a person's temperament or behavior. People's temperaments are influenced by a variety of factors, including personality, upbringing, and environment, rather than their appearance. It's important to avoid making judgments based on superficial traits.