strong, unsure, flexible, rickety, infirm, precarious, insecure, change, shaky, tottery, wobbly, unstable, unsteady, weak.
oscillating (part of speech: verb)
stumbling (part of speech: verb)
The room was burst into, and the wretched, tottering
wife, hanging upon her sobbing servants, found her lover, her husband, her child's father, lying on the floor, dead by his own hand; stone dead.
- "Put Yourself in His Place", Charles Reade.
Under the light he saw the Swiss was holding to the other feebly, and that his steps were tottering
- "Ashton-Kirk, Criminologist", John T. McIntyre.
Benjamin Wright, tottering
a little, changed his cane from his left to his right hand, and chewed orange- skin fiercely.
- "The Awakening of Helena Richie", Margaret Deland.