Origin: 1625–35; < F
gaieté, equiv. to
gai gay +
-té -ty 2 
Synonyms:
1. merriment, mirth, glee, jollity, joyousness, liveliness, sportiveness, hilarity, vivacity, cheerfulness, joviality. 3. brilliance, glitter, flashiness, gaudiness.
Antonyms:
1. sadness.