joyfully is an adverb. ly is the usual adverb suffix.
Adverb.
More joyfully and most joyfully.
more joyfully, most joyfully
An antonym for joyfully is unhappily.
He jumped joyfully.
Joyfully, he did a little dance.
The comparative form of "joyfully" is "more joyfully," and the superlative form is "most joyfully." These forms are used to compare the degree or intensity of the adverb "joyfully" in relation to other actions or states. In comparative form, it is used when comparing two actions or states, while the superlative form is used when comparing three or more actions or states.
what type of speech is think
joyfully
boring
a type of speech
joylessly, unhappily