adjective
wild, untamed
Synonyms: aboriginal, ancient, archaic, barbarian, barbaric, bestial, brutal, brute, crude, earliest, feral, ferocious, fierce, first, fundamental, harsh, in a state of nature, lupine, native, natural, nonliterate, original, primary, primeval, primitive, primordial, pristine, rough, rude, rugged, rustic, simple, turbulent, unbroken, uncivilized, uncultivated, uncultured, undomesticated, unmodified, unrestrained, unspoiled, vicious
Antonyms: calm, civilized, domesticated, tame
adjective
cruel, vicious
Synonyms: atrocious, barbarous, beastly, bestial, bloodthirsty, bloody, brutal, brutish, cold-blooded, crazed, demoniac, destructive, devilish, diabolical, fell, feral, ferine, ferocious, fierce, frantic, furious, grim, harsh, heartless, hellish, infernal, inhuman, inhumane, malevolent, malicious, merciless, murderous, pitiless, rabid, raging, rapacious, ravening, relentless, remorseless, ruthless, sadistic, truculent, unrelenting, violent, wolfish
Antonyms: benign, kind, nice