Animated, gay, or vivacious; lively, spirited.
Of a person: full of life and vigour, especially with a light and springy step.
Especially of an older person: energetic and in good health; spry.
In a lively and vigorous way; sprightlily.
Inconstant in purpose, or volatile in behavior.
Lacking regularity or uniformity.
Not held firmly in position, physically unstable.
To render unsteady, removing balance.