Definitions of insecure:

• adjective:   lacking self-confidence or assurance

  Example: "An insecure person lacking mental stability"

• adjective:   lacking in security or safety

  Example: "His fortune was increasingly insecure"

• adjective:   not firm or firmly fixed; likely to fail or give way

  Example: "The hinge is insecure"

• adjective:   not safe from attack
• adjective:   not financially safe or secure