cheerfully adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

Is the word cheerfully an adjective?

CHEERFULLY (adverb) definition and synonyms | Macmillan Dictionary.

What kind of adverb is cheerfully?

happily, unthinkingly, and unhesitatingly. It seems that in the sense of "happily" or "unhesitatingly," the word "cheerfully" works as a VP adverb, while used in the sense of "unthinkingly" the same word now functions as a sentence adverb.