When something is unsteady, it wobbles, shakes, or moves in an uncertain way instead of staying firm and stable. A ladder leaning against a wall might feel unsteady when you start to climb it, making you worry it could slip. A toddler learning to walk takes unsteady steps, arms outstretched for balance. A stack of books piled too high becomes unsteady and threatens to topple over.

The word can also describe things that change unpredictably or lack reliability. A student's grades might be unsteady, sometimes excellent and sometimes poor, without a clear pattern. Someone's voice might become unsteady when they're nervous or upset, wavering and shaking instead of sounding confident and clear.

The opposite of unsteady is steady, which means firm, stable, and reliable. When you steady something, you make it stop wobbling or shaking: you might steady a wobbly table by sliding a folded napkin under one leg, or steady yourself by grabbing a railing. The key to understanding unsteady is recognizing that lack of stability: whether it's physical wobbling or unreliable performance, something unsteady can't quite be counted on to stay put or stay consistent.