IPA: /ˈnɒnˌjuːzər/
KK: /ˈnɒnˌjuːzər/
A person who does not use something, such as a service, product, or substance like drugs or alcohol.
The program aims to encourage nonusers to try the new community center facilities.
Nonuser → It is formed from "non-" (meaning not) and "user" (from Old French *user*, meaning to use). The word "nonuser" refers to someone who does not use something.
Think of 'not' ('non-') using something ('user') — that's why a nonuser is someone who does not use.