wobble

verb (used without object), wob·bled, wob·bling.

1. to incline to one side and to the other alternately, as a wheel, top, or other rotating body when not properly balanced.
2. to move unsteadily from side to side: The table wobbled on its uneven legs.
3. to show unsteadiness; tremble; quaver: His voice wobbled.
4. to vacillate; waver.