Villainy is a related term of heinousness.
As nouns the difference between villainy and heinousness
is that villainy is evil or vicious character or behaviour while heinousness is the property of being heinous.
villainy
English
Noun
(villainies)
Evil or vicious character or behaviour.
A vicious or treacherous act.
Synonyms
See
heinousness
English
Noun
(-)
The property of being heinous.
Related terms
* atrocity
* cruelty