Aggression is a forceful and hostile behavior that is often linked with violence and anger. Synonyms for the term aggression include hostility, animosity, belligerence, and aggression. Other terms that can be used as replacements for aggression include attack, assault, outrage, and offense. When used in a positive and assertive way, the word can also refer to the strength and determination displayed by an individual. In this context, synonyms for aggression include assertiveness, boldness, and confidence. Generally, the context in which the term is used will determine the most appropriate synonym to use.