wobble

When something wobbles, it moves slightly back and forth or side to side, or it is unsteady.

• The old man wobbled up the stairs, taking one step at a time.
• This table wobbles a little because one leg is shorter than the other three legs.
• In order to stop a table from wobbling, I put a piece of wadded up paper underneath one of the legs.
• Frank’s one-year old nephew wobbles when he walks.
• After spending several weeks in bed due to sickness, Penelope wobbled as she walked around her house.
• There’s a detectable wobble in distant stars orbited by planets. (This sentence uses "wobble" as a noun.)

The word "wobbly" is an adjective.

• The table is a little wobbly.
• A newly born calf is a little wobbly on its legs.
• A baby who has just learned to walk is wobbly.
• It’s not a good idea to stand on a wobbly, three-legged swivel chair.

Don’t stand on a wobbly, three-legged swivel chair!