vicious

adjective

Mean-spirited or deliberately hurtful; malicious.

adjective

Extremely violent or injurious; cruel.

adjective

Marked by an aggressive disposition. Used chiefly of animals.

adjective

Disposed to violent or destructive behavior.

adjective

Severe, powerful, or intense; fierce.

adjective

Having the nature of vice; evil, immoral, or depraved.

adjective

Given to vice, immorality, or depravity.

adjective

Faulty or defective.