anonymous

adjective

1. 1

   Lacking a name; not named, for example an animal not assigned to any species.

2. 2

   Without any name acknowledged of a person responsible

   “an anonymous pamphlet”

3. 3

   Of unknown name; whose name is withheld

   “No customer personal data will be retained unless it is rendered anonymous.”

4. 4

   Lacking individuality.

   “an anonymous office block in a soulless industrial estate”