non-entity

noun, plural non·en·ti·ties.

1. a person or thing of no importance.
2. something that does not exist or exists only in imagination.
3. nonexistence.

noun plural -ties

1. an insignificant person or thing
2. a nonexistent thing
3. the state of not existing; nonexistence

n.also nonentity, c.1600, “something which does not exist,” from non- + entity. Meaning “a person or thing of no importance” is attested from 1710.