unsure

Adjective

• 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
    

• lacking self-confidence
  • stood in the doorway diffident and abashed
    
  • problems that call for bold not timid responses
    
  • a very unsure young man
    

Related words

• Synonyms: 
  uncertain , incertain , diffident , shy , timid
• Antonyms: 
  certain(p) , sure , confident