1) Blithely 2) Happily 3) In a jovial way 4) In a joyous manner 5) In cheerful fashion 6) Jubilantly 7) Lightheartedly 8) Merrily 9) Mirthfully 10) With festiveness 11) With happiness Found on https://www.crosswordclues.com/clue/gayly
• (adv.) With mirth and frolic; merrily; blithely; gleefully. • (adv.) Finely; splendidly; showily; as, ladies gayly dressed; a flower gayly blooming. Found on http://thinkexist.com/dictionary/meaning/gayly/