unsteady
adj.not steady or firm. You use this to describe something that is likely to fall, move, or change suddenly.
adj.lacking steadiness or firmness; likely to waver or collapse. Often describes physical movement, emotional states, or unstable economic conditions.
“The old wooden floor feels very unsteady under my feet.”
“After drinking too much coffee, he felt unsteady and had to hold onto the wall to stay upright.”
“The market remained unsteady throughout the afternoon as investors waited for the central bank to announce its final interest rate decision.”
“With Itauma barely able to stand, his legs unsteady and body swaying before slumping in the corner, his team threw in the towel.”
From un- + steady. Like steady, the word first appeared in English around 1530. The word is comparable to Old Frisian onstedich, Low German unstadig, etc.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.