Nonuser

noun

1. One who refrains from the use of something, as of narcotic drugs or alcohol.
2. In law: Neglect or omission to use an easement or other right: as, the non-user of a corporate franchise.
3. Neglect of official duty; default of performing the duties and services required of an officer.
4. A not using; failure to use.
5. Neglect or omission to use an easement or franchise or to assert a right.