Source : WordNet®

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}]
     [also: {unsteadied}]