What is the opposite of adjective?

An adjective is a Word that describes a noun... So the opposite of that would be a Word that doesn't describe a noun...

But seriously, perhaps what you are looking for is the adverb, which is a Word that describes a verb. Same concept as an adjective, but very different direction.

Actually, an adverb is a Word that modifies a verb, an adjective, or another adverb.

Read more: What_is_the_opposite_of_an_adjective