One of the most main is -ful. This would make the word joyful.
slowy ,kindy ,mornfully ,hopfully ,joyfully ,lovely etc.
Adverb.
The suffix for undo is to not do.
the suffix is on
The suffix of inundate is -ate. This suffix means in condition of.
joyfully is an adverb. ly is the usual adverb suffix.
More joyfully and most joyfully.
slowy ,kindy ,mornfully ,hopfully ,joyfully ,lovely etc.
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.
joyfully
boring
joylessly, unhappily
Adverb.