1 : quick and eager; "an alacritous response to the invitation"
2 : vigorous and animated; "a vibrant group that challenged the system"; "a charming and vivacious hostess"; "a vivacious folk dance"
3 : full of spirit and vitality; "a sprightly young girl"; "a sprightly dance"
4 : having a cheerful, lively, and self-confident air; "looking chipper, like a man...diverted by his own wit"- Frances G. Patton; "life that is gay, brisk, and debonair"- H.M.Reynolds; "walked with a jaunty step"; "a jaunty optimist"
