(1):

(a.) Bitter; spiteful; malignant.

(2):

(a.) Characterized by vice or defects; defective; faulty; imperfect.

(3):

(a.) Addicted to vice; corrupt in principles or conduct; depraved; wicked; as, vicious children; vicious examples; vicious conduct.

(4):

(a.) Wanting purity; foul; bad; noxious; as, vicious air, water, etc.

(5):

(a.) Not well tamed or broken; given to bad tricks; unruly; refractory; as, a vicious horse.

(6):

(a.) Not correct or pure; corrupt; as, vicious language; vicious idioms.