IPA: /ˈheɪtfəl.nəs/
KK: /ˈheɪtfəlˌnɛs/
The quality or state of having strong feelings of dislike or anger towards someone or something.
His hatefulness towards injustice was evident in his passionate speeches.
Hatefulness → It is formed from "hate" (from Old English *hatian*, meaning to hate) and "-fulness" (meaning the state of being full of). The word "hatefulness" means the state of being full of hate or having a strong dislike.
Think of being 'full of hate' — 'hate' describes a strong dislike, and '-fulness' indicates a state of being.