What are heinous crime?

a heinous crime is one committed by one who will take it to the extreme, very brutal and cruel, a monstrous murderer.

Heinous crime is a willful crime punishable in law by death penalty (in some countries/regions) and unacceptable in society as extremely evil & cruel crime.

Hate crimes. Like harming someone specifically because of their race or different from the charged.

These crimes are oftentimes referred to as 'crimes of moral turpitude' but (in the US) there are no statutes that include a separate (or an enhanced) charge for being "heinous" crimes.

Heinous means, shocking, evil, monstrous, grave, awful, vicious, outrageous, revolting, infamous, hideous, unspeakable, atrocious, flagrant, odious, hateful, abhorrent, abominable, villainous,...