incommunicado vs off the grid

incommunicado

adv
  • In a manner in which communication with outsiders is not possible, for either voluntary or involuntary reasons, especially due to confinement or reclusiveness. 

adj
  • In a state or condition of inability or unwillingness to communicate. 

off the grid

adv
  • In or into a clandestine or isolated situation or place, especially one in which public communication is curtailed. 

  • Secretly; in a clandestine manner. 

  • In or into a situation or place in which electricity from the public electricity system is not used. 

adj
  • Not connected to a publicly available communication system, such as the World Wide Web or a mobile telephone network. 

  • Isolated; in a remote location; in seclusion; not participating in some official process or system. 

  • Not using electricity from the public electrical supply system. 

How often have the words incommunicado and off the grid occurred in a corpus of books? (source: Google Ngram Viewer )