Definition of vicious

• a. - Characterized by vice or defects; defective; faulty; imperfect.
• a. - Addicted to vice; corrupt in principles or conduct; depraved; wicked; as, vicious children; vicious examples; vicious conduct.
• a. - Wanting purity; foul; bad; noxious; as, vicious air, water, etc.
• a. - Not correct or pure; corrupt; as, vicious language; vicious idioms.
• a. - Not well tamed or broken; given to bad tricks; unruly; refractory; as, a vicious horse.
• a. - Bitter; spiteful; malignant.