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.
The word 'heinous' means extremely wicked, deeply criminalSource: True Knowledge
the young child was heinous to his parents.