悪質な (translations)→ bad mean nasty vile
悪性の (translations)→ malicious malignant
邪悪な (translations)→ corrupt evil lurid pervasive
致命的な (translations)→ deadly fatal serious
破壊的な (translations)→ destructive ravaging
不治の (translations)→ irremediable
有害な (translations)→ deleterious detrimental harmful hazardous toxic undesirable unwholesome