inviolable

Adjective

• not capable of being violated or infringed
  • infrangible human rights
    

• must be kept sacred

• immune to attack; incapable of being tampered with
  • an impregnable fortress
    
  • fortifications that made the frontier inviolable
    
  • a secure telephone connection
    

• incapable of being transgressed or dishonored
  • the person of the king is inviolable
    
  • an inviolable oath
    

Related words

• Synonyms: 
  absolute , infrangible , inviolate , sacrosanct , impregnable , secure , strong , unassailable , unattackable