adjective
a word that describes or modifies a noun or pronoun, in this case 'unsure' describes a state of uncertainty or lack of confidence
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She was unsure about the accuracy of the data presented in the report.
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I'm feeling a bit unsure about going to the party tonight.
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I'm totally unsure if I should text my crush or not.
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His mind was a maze of uncertainties, leaving him feeling unsure about his next move.