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From The Collaborative International Dictionary of English v.0.48:
Vicious \Vi"cious\, a. [OF. vicious, F. vicieux, fr. L. vitiosus, fr. vitium vice. See Vice a fault.] 1. Characterized by vice or defects; defective; faulty; imperfect. [1913 Webster] Though I perchance am vicious in my guess. --Shak. [1913 Webster] The title of these lords was vicious in its origin. --Burke. [1913 Webster] A charge against Bentley of vicious reasoning. --De Quincey. [1913 Webster] 2. Addicted to vice; corrupt in principles or conduct; depraved; wicked; as, vicious children; vicious examples; vicious conduct. [1913 Webster] Who . . . heard this heavy curse, Servant of servants, on his vicious race. --Milton. [1913 Webster] 3. Wanting purity; foul; bad; noxious; as, vicious air, water, etc. --Dryden. [1913 Webster] 4. Not correct or pure; corrupt; as, vicious language; vicious idioms. [1913 Webster] 5. Not well tamed or broken; given to bad tricks; unruly; refractory; as, a vicious horse. [1913 Webster] 6. Bitter; spiteful; malignant. [Colloq.] [1913 Webster] Syn: Corrupt; faulty; wicked; depraved. [1913 Webster] -- Vi"cious*ly, adv. -- Vi"cious*ness, n. [1913 Webster]