malignant

malignant

adjective atrocious, baleful, baneful, bitter, blackhearted, bloodthirsty, brutal, brutish, caustic, cold-blooded, coldhearted, consuming, corrosive, cruel, damaging, dangerous, deadly, death-bringing, death-dealing, deathly, deleterious, demoniacal, despiteful, destructive, detrimental, devilish, diabolical, envenomed, evil, evil-minded, execrable, fatal, fell, feral, ferocious, fiendish, fiendlike, flint-hearted, foul, hard of heart, harmful, hateful, heinous, hellish, hostile, hurtful, ill-intentioned, inhuman, iniquitous, injurious, insalubrious, invidious, lethal, malefic, maleficent, malevolent, malicious, malign, mephitic, miasmal, miasmatic, monstrous, morbid, morbiferous, morbific, morbifical, murderous, nasty, nefarious, nocuous, noisome, noxious, oppressive, peccant, pernicious, persecuting, pestilential, poisonous, rancorous, resentful, ruinous, ruthless, satanic, savage, scatheful, scurrilous, sinful, sinister, spiteful, spleenful, stonyhearted, tending to cause death, toxic, toxiferous, treacherous, unmerciful, venomous, vicious, vile, villainous, violent, virulent, virulently inimical, vitriolic, wicked

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See also: bad, caustic, contemptuous, cruel, dangerous, deadly, deleterious, detrimental, diabolic, disadvantageous, fatal, inferior, lethal, libelous, malevolent, malicious, nefarious, noxious, offensive, outrageous, peccant, pernicious, pestilent, resentful, ruthless, scathing, sinister, spiteful, vicious, vindictive, virulent