Not feeling, showing, or done with confidence and certainty,
Not feeling, showing, or done with confidence and certainty
she was feeling nervous, unsure of herself
she was unsure how to reply
(of a fact) Not fixed or certain
the date is unsure
diffident: lacking self-confidence; "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man"
uncertain: lacking or indicating lack of confidence or assurance; "uncertain of his convictions"; "unsure of himself and his future"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers"