wobbly
Shaky and unsteady, like it might tip over.
Wobbly describes something that moves unsteadily from side to side, like it might tip over at any moment. A table with one short leg is wobbly. A tower of blocks gets wobbly as it grows taller. When you first learn to ride a bike, your balance feels wobbly before you gain confidence and control.
The word captures that uncertain, shaky quality of things that aren't quite stable. A loose tooth feels wobbly in your mouth. A toddler taking their first steps looks wobbly. Even someone's voice can sound wobbly when they're nervous or about to cry, wavering instead of staying steady.
Wobbly can also describe feeling physically unsteady yourself. After spinning around in circles, you might feel wobbly and dizzy. Standing on a moving boat can make your legs feel wobbly as they adjust to the motion. The word captures that sensation of things not being quite solid or secure, whether it's a physical object, a feeling, or your own balance.