'Vicious' definitions:

Definition of 'vicious'

From: WordNet
adjective
(of persons or their actions) able or disposed to inflict pain or suffering; "a barbarous crime"; "brutal beatings"; "cruel tortures"; "Stalin's roughshod treatment of the kulaks"; "a savage slap"; "vicious kicks" [syn: barbarous, brutal, cruel, fell, roughshod, savage, vicious]
adjective
Having the nature of vice [syn: evil, vicious]
adjective
Bringing or deserving severe rebuke or censure; "a criminal waste of talent"; "a deplorable act of violence"; "adultery is as reprehensible for a husband as for a wife" [syn: condemnable, criminal, deplorable, reprehensible, vicious]
adjective
Marked by deep ill will; deliberately harmful; "poisonous hate"; "venomous criticism"; "vicious gossip" [syn: poisonous, venomous, vicious]

Definition of 'Vicious'

From: GCIDE
  • 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]

Synonyms of 'vicious'

From: Moby Thesaurus