1. Excited with merriment; manifesting sportiveness or delight; inspiring delight; livery; merry. Belinda smiled, and all the world was gay. (Pope) Gay hope is theirs by fancy fed. (Gray)
2. Brilliant in colours; splendid; fine; richly dressed. Why is my neighbor's wife so gay? (Chaucer) A bevy of fair women, richly gay in gems and wanton dress (Milton)
3. Loose; dissipated; lewd.
Synonym: merry, gleeful, blithe, airy, lively, sprightly, sportive, light-hearted, frolicsome, jolly, jovial, joyous, joyful, glad, showy, splendid, vivacious.