Adjective
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"2. not safe from danger or mishap;
"faced an uncertain future""an unsure existence"3. lacking self-confidence;
"stood in the doorway diffident and abashed""problems that call for bold not timid responses""a very unsure young man"