unsteady (
http://definr.com/unsteady)
adj 1: subject to change or variation especially in behavior; "her
unsteady walk"; "his hand was unsteady as he poured
the wine"; "an unsteady voice" [ant:
steady]
2: not having a steady rhythm; "an arrhythmic heartbeat" [syn:
arrhythmic,
jerking,
jerky]
3: not firmly or solidly positioned; "climbing carefully up the
unsteady ladder"; "an unfirm stance" [syn:
unfirm]