IPA: /ˈrɔːŋfəl.nəs/
KK: /ˈrɔŋfələs/
The condition of being morally or legally wrong; the quality of being unjust or improper.
The wrongfulness of his actions led to serious consequences.
Wrongfulness → It is formed from "wrong" (from Old English *wrang*, meaning not right or unjust) and "-ful" (meaning full of) and "-ness" (meaning the state of). The word "wrongfulness" means the state of being full of wrong or unjust actions.
Think of being 'full of' ('-ful') 'not right' ('wrong') — that's why wrongfulness refers to the state of being unjust.