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.

adjective

gentle , good , nice , right , friendly , kind , pleasant

adjective

abandoned , abhorrent , atrocious , bad , barbarous , base , contaminated , cruel , dangerous , debased , degenerate , degraded , demoralized , depraved , diabolical , faulty , ferocious , fiendish , flagitious , foul , heinous , immoral , impious , impure , indecent , infamous , iniquitous , insubordinate , lewd , libidinous , licentious , miscreant , monstrous , nefarious , perverse , profligate , putrid , reprehensible , reprobate , rotten , savage , sinful , unprincipled , untamed , vile , villainous , violent , wicked , wild , worthlessnotes:vicious is savage or cruel; viscous is thick or gummy , as a liquid that is hard to pour , backbiting * , beastly , bloodthirsty , brutal , cussed , defamatory , despiteful , dirty * , evil , fierce , frightful , furious , horrid , intense , lousy * , malevolent , malicious , malign , mean , murderous , ornery * , poisonous , rancorous , rough , slanderous , spiteful , tough , vehement , venomous , vindictive , wickednotes:vicious is savage or cruel; viscous is thick or gummy , black , peccant , wrong , hateful , malignant , nasty , bestial , fell , feral , inhuman , truculent , wolfish , (colloq.) malignant , corrupt , corrupting , debasing , defective , egregious , flagrant , imperfect , noxious , refractory , severe , terrible , unmanageable , unruly