Source : WordNet®

unsure
     adj 1: 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" [syn: {uncertain}, {incertain}]
            [ant: {certain(p)}, {certain(p)}]
     2: not safe from danger or mishap; "faced an uncertain future";
        "an unsure existence" [syn: {uncertain}]
     3: lacking self-confidence; "stood in the doorway diffident and
        abashed"; "problems that call for bold not timid
        responses"; "a very unsure young man" [syn: {diffident}, {shy},
         {timid}]