vicious

Synonyms: 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 worthless

Antonyms: gentle good nice right

Synonyms: backbiting beastly bloodthirsty brutal cruel cussed defamatory despiteful dirty evil fierce frightful furious horrid intense lousy malevolent malicious malign mean murderous ornery poisonous rancorous rough savage slanderous spiteful tough vehement venomous vindictive violent wicked

Antonyms: friendly kind nice pleasant