Vicious/ˈvɪʃəs/ Definition 1 of 3Pro Tip 1/3Intense Hostility Describes actions or feelings that are not just cruel, but intensely hostile. His vicious response left everyone stunned. Pro Tip 2/3Beyond Mean Implies behavior that goes far beyond being mean, suggesting extreme aggression. A vicious personal attack, unlike ordinary criticism, feels ruthless. Pro Tip 3/3Not Light-Hearted Contrasts with light-hearted teasing or play; 'vicious' implies real intent to harm. Her joke was vicious, not just playful banter.