happily
adv. manneradv. in a way that shows you are glad or satisfied. You can also use it to say you are willing to do something.
adv. in a cheerful or contented manner; also used as a sentence modifier to indicate willingness or a fortunate outcome.
The children played happily in the garden all afternoon.
She happily accepted the invitation to speak at the conference because she loved the topic.
The two companies happily settled their dispute out of court, avoiding a lengthy and expensive legal battle that would have damaged both their reputations.
From Middle English happily, happyly, happyliche, happylyche, equivalent to happy + -ly.
As a manner adverb, it typically follows the verb; as a sentence adverb expressing willingness, it often precedes the main verb.
He did the work happyHe did the work happilyLearners often use the adjective 'happy' when an adverb is required to describe the action.