[adj] not firmly or solidly positioned; "climbing carefully up the unsteady ladder"; "an unfirm stance"
[adj] not having a steady rhythm; "an arrhythmic heartbeat"
[adj] subject to change or variation especially in behavior; "her unsteady walk"; "his hand was unsteady as he poured the wine"; "an unsteady voice"
Synonyms
aflicker(p), arrhythmic, convulsive, faltering, flickering, fluctuating, fluttering, irregular, jerking, jerky, lurching, palpitant, palpitating, palsied, quaking, quavering, quivering, shaking, shaky, shivering, shuddering, spasmodic, spastic, staggering