VI'CIOUS, adjective [Latin vitiosus.] 1. Defective; imperfect; as a system of government vicious and unsound. 2. Addicted to vice; corrupt in principles or conduct; depraved; wicked; habitually transgressing the moral law; as a vicious race of men; vicious parents; vicious children. 3. Corrupt; contrary to moral principles or to rectitude; as vicious examples; vicious conduct. 4. Corrupt, in a physical sense; foul; impure; insalubrious; as vicious air. 5. Corrupt; not genuine or pure; as vicious language; vicious idioms. 6. Unruly; refractory; not well tamed or broken; as a vicious horse.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI