unsure

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”

not safe from danger or mishap

• “faced an uncertain future”
• “an unsure existence”

lacking self-confidence

• “stood in the doorway diffident and abashed”
• “problems that call for bold not timid responses”
• “a very unsure young man”