Used other than figuratively or idiomatically: see on, wheels. (Having wheels affixed to the bottom, and so transportable; synonym of wheeled).
Mobile; able to be moved; especially, synonym of on the move.
To a large degree, excessively.
To render unsteady, removing balance.
Inconstant in purpose, or volatile in behavior.
Lacking regularity or uniformity.
Not held firmly in position, physically unstable.