insecure in WordNet English dictionary

1. lacking self-confidence or assurance
   "an insecure person lacking mental stability"
   insecure 
   
2. lacking in security or safety
   "his fortune was increasingly insecure"; "an insecure future"
   insecure  unsafe 
   
3. not firm or firmly fixed; likely to fail or give way
   "the hinge is insecure"
   insecure 
   
4. not safe from attack
   insecure  unsafe