nonuser

noun

1. A person who is not a user (of drugs, a computer system, etc.).
2. Neglect or omission to use an easement or franchise or to assert a right.

   “An office may be forfeited by mis-user or non-user.”

   “The subject of the forfeiture of corporate franchises by nonuser or misuser , was fully discussed in the case of The King v . Amery”