Can Hateful Be an Adjective?

HATEFUL (adjective) definition and synonyms | Macmillan Dictionary.

Is the word hateful an adjective?

Use the adjective hateful for things that deserve hatred (like racist speech or injustice) or are full of hatred (like the hateful things you mutter about your brother under your breath).

Is Hateful an adverb?

In a hateful manner.