Webster's Revised Unabridged Dictionary · 1913

Vicious

Vicious , adjective

[Old French vicious, French vicieux, from Latin vitiosus, from vitium vice. See Vice a fault.]

1.
Characterized by vice or defects; defective; faulty; imperfect.
Though I perchance am vicious in my guess. — Shakespeare
The title of these lords was vicious in its origin. — Burke
A charge against Bentley of vicious reasoning. — De Quincey
2.
Addicted to vice; corrupt in principles or conduct; depraved; wicked; as, vicious children; vicious examples; vicious conduct.
Who... heard this heavy curse, Servant of servants, on his vicious race. — Milton
3.
Wanting purity; foul; bad; noxious; as, vicious air, water, etc. — Dryden
4.
Not correct or pure; corrupt; as, vicious language; vicious idioms.
5.
Not well tamed or broken; given to bad tricks; unruly; refractory; as, a vicious horse.
6.
Bitter; spiteful; malignant. [Colloquial]