Monstrousness is a related term of heinousness.
As nouns the difference between monstrousness and heinousness
is that monstrousness is (uncountable) the state or condition of being monstrous while heinousness is the property of being heinous.
monstrousness
English
Noun
(uncountable) The state or condition of being monstrous.
(countable) Something monstrous.
heinousness
English
Noun
(-)
The property of being heinous.
Related terms
* atrocity
* cruelty