unsteady

Not held firmly in position; physically unstable.

A slightly unsteady item of furniture.

"Mid-Lent, and the Enemy grins," remarked Selwyn as he started for church with Nina and the children. Austin, knee-deep in a dozen Sunday supplements, refused to stir; poor little Eileen was now convalescent from grippe, but still unsteady on her legs; her maid had taken the grippe, and now moaned all day:[…]"

Lacking regularity or uniformity.

Inconstant in purpose, or volatile in behavior.

To render unsteady, removing balance.