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