Unnamed
Part of speech: adjective
Definition: Not having a name.
Anonymous
Part of speech: adjective
Definition: Lacking a name; not named and determined, as an animal not assigned to any species.Without any name acknowledged of a person responsible, as that of author, contributor, or the like.Of unknown name; whose name is withheldLacking individuality.
Example sentence: To me, constructive criticism is when people take ownership of their ideas. That's why I don't listen to anything that's anonymous. But it's hard; when there's something hurtful out there, I still want to read it over and over and memorize it and explain my point of view to the person.