Na-adjective (keiyodoshi), Noun
atrocious; heinous; fiendish; brutal; vicious
最近の凶悪事件をニュースで見るたび、バーチャルな世界と生きる世界の区別がなくなった若者が急増していることに気付かされる。These days when I hear about these horrible incidents on the news I get the feeling that more and more young people are losing their ability to distinguish between real and virtual worlds.
Also written 兇悪【きょうあく】