The term 'INCOMMUNICADO' is a 13-letter word meaning 'unable to be reached'. It is derived from the Spanish phrase 'sin comunicación', which literally translates to 'without communication'. In English, it is used to describe someone who is not able to communicate with the outside world, either by choice or due to external circumstances. This could include someone who is in solitary confinement, or someone who has gone into hiding. In either case, the person is unable to be reached.