1 cheerful, happy, gay, cheery, jolly, jovial, in high or good spirits, mirthful, joyful, joyous, hilarious, jubilant, rejoicing, festive, exhilarating, exuberant, vivacious, convivial, buoyant, gleeful, blithe, blithesome, carefree, light-hearted, delighted:
Didn't we have a merry old time at the Christmas party!
2 make merry. revel, celebrate, carouse, frolic:
The guests made merry till the wee hours of the morning.