insecure

/ˌɪnsɪˈkjʊr/
adjective
  1. Not confident or sure about yourself; feeling uncertain or anxious about your own worth or abilities.
    • She felt insecure about her presentation and practiced it many times.
    • Many teenagers feel insecure when they start a new school.
    • He is insecure about his height and often slouches to seem shorter.
  2. Not safe or protected; likely to fail, be lost, or be harmed.
    • The old bridge was declared insecure and closed to traffic.
    • Using a simple password makes your online account insecure.
    • They lived in an insecure neighborhood where theft was common.
  3. Not firmly fixed or attached; likely to move or fall.
    • The ladder felt insecure because one of its legs was loose.
    • She tightened the insecure bolt on the chair before sitting down.
    • The insecure shelf collapsed under the weight of the books.