1.Definition: full of or showing high-spirited merriment

"Have a merry Christmas", "Peals of merry laughter"

Related Adjective(s):gay, jocund, jolly, jovial, mirthful

2.Definition: offering fun and gaiety

"A merry evening"

Related Adjective(s):festal, festive, gay

3.Definition: quick and energetic

"A merry chase"

Related Adjective(s):alert, brisk, lively, rattling, snappy, spanking, zippy