inaccessible

Adjective

• not capable of being obtained
  • a rare work, today almost inaccessible
    
  • timber is virtually unobtainable in the islands
    
  • untouchable resources buried deep within the earth
    

• capable of being reached only with great difficulty or not at all

Related words

• Synonyms: 
  unobtainable , unprocurable , untouchable , unaccessible