What character trait is associated with unwarranted vicious behavior?

The character trait associated with unwarranted vicious behavior is true aggression. This term refers specifically to hostile actions that are not provoked and often result in harm to others or property. This type of aggression is not simply a reaction to a threat or danger; rather, it is a display of uncontrolled and irrational behavior that can arise from a variety of factors, including fear, frustration, or an innate predisposition towards aggression.

True aggression is typically characterized by a lack of empathy and a propensity to cause harm without justification. This distinguishes it from other traits, such as feral tendency, which may describe wild or untamed behavior but does not inherently imply maliciousness. Courage might suggest taking risks for a noble cause, which is not related to vicious behavior, while moodiness refers to fluctuations in emotional states that do not directly correlate with aggression. Thus, true aggression is the most accurate descriptor of behavior that is unwarranted and vicious.