Etymology
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unsure (adj.)

c. 1400, "not safe against attack," also "lacking certainty," from un- (1) "not" + sure (adj.).

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Definitions of unsure

unsure (adj.)
lacking self-confidence;
a very unsure young man
Synonyms: diffident / shy / timid
unsure (adj.)
lacking or indicating lack of confidence or assurance;
unsure of himself and his future
moving with uncertain (or unsure) steps
Synonyms: uncertain / incertain
From wordnet.princeton.edu