unsure
adj.-
1 not certain (adj.) A2 Elementarynot feeling certain or confident about something.
lacking certainty or confidence; feeling hesitant about a fact, decision, or outcome.
ExampleI am unsure of the exact time the train leaves, so let's check the app.
ExampleThe committee remained unsure about the long-term financial implications of the merger, despite the optimistic projections provided by the consultants.
PitfallI am unsure for the answer.I am unsure of the answer.Use 'of' or 'about' after unsure when followed by a noun phrase.
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2 unstable (adj.) C1 Advanced Literarynot steady or safe, like a floor that might break or a person who might fall.
physically unstable, precarious, or lacking a firm foundation.
ExampleThe old wooden bridge felt unsure under my feet as I crossed the river.
ExampleHe took an unsure step onto the icy pavement, his balance wavering as he searched for a stable handhold.
UsageOften used to describe physical footing or movement that lacks confidence.
From Middle English unsure, equivalent to un- + sure. Piecewise doublet of insecure and unsecure.