If you are unsteady, you have difficulty doing something, for example walking, because you cannot completely control your legs or your body.
The boy was very unsteady and had staggered around when he got up.
那个男孩站不稳,起身后走路摇摇晃晃。
If you describe something as unsteady, you mean that it is not regular or stable, but unreliable or unpredictable.
His voice was unsteady and only just audible.
他的声音颤抖,而且小得只能勉强听到。
Unsteady objects are not held, attached, or balanced securely.
a slightly unsteady table.
一张不太牢固的桌子。