na-adjective, noun which may take the genitive case particle 'no', noun
heinous; atrocious; extremely wicked
Describes crimes, acts, or people of extreme evil or cruelty. Often used in news and formal contexts.
彼は極悪な犯罪を犯した。
He committed a heinous crime.
極悪非道な行為は許されない。
Atrocious and inhuman acts are unforgivable.