IPA: /ˈheɪt.fəl/
KK: /ˈheɪtfəl/
Causing or showing strong dislike or anger towards someone or something.
His hateful comments hurt many people's feelings.
Hateful → It is formed from "hate" (from Old English "hatian", meaning to dislike or detest) and "-ful" (meaning full of). The word "hateful" means full of hate or expressing strong dislike.
Think of being 'full of hate' — 'hate' shows strong dislike, and '-ful' means full of something.