addicted to or characterized by vice; grossly immoral; depraved; profligate

a vicious life.

given or readily disposed to evil

a vicious criminal.

reprehensible; blameworthy; wrong

a vicious deception.

spiteful; malicious

vicious gossip; a vicious attack.

unpleasantly severe

a vicious headache.

characterized or marred by faults or defects; faulty; unsound

vicious reasoning.

savage; ferocious

They all feared his vicious temper.

(of an animal) having bad habits or a cruel or fierce disposition

a vicious bull.

Archaic . morbid, foul, or noxious.

noun

despitefulness , ill will , malice , maliciousness , malignancy , malignity , meanness , nastiness , poisonousness , spite , spitefulness , venomousness