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without any name acknowledged, as that of author, contributor, or the like:
an anonymous letter to the editor; an anonymous donation.
of unknown name; whose name is withheld:
an anonymous author.
lacking individuality, unique character, or distinction:
an endless row of drab, anonymous houses.
Contemporary Examples

When an explosion tears through Barneys, Aidan receives an anonymous email reading “She did it,” and a picture of Paige.
A Novel for Our Time Claire Howorth April 29, 2010

This is the third of a three part essay that was submitted by an anonymous young writer.
I Was Adam Lanza, Part 3 David Frum December 22, 2012

He will continue to work at the brand consultancy companies he co-founded, Announcement and The anonymous Partner.
Stella McCartney’s Husband New, Bigger Footprint Tom Sykes February 14, 2013

The anonymous British street artist announces a month-long residency in the Big Apple.
British Artist Banksy Stages Guerrilla Street Art Show in New York City Justin Jones October 2, 2013

By yesterday, he had reopened the sites for his users to resume the snarky, anonymous barbs that are the company’s hallmark.
New Gawker Security Breach Brian Ries December 13, 2010

Historical Examples

So she wrote an anonymous letter calculated to do harm to the unlucky subject thereof?
Afterwards Kathlyn Rhodes

Except Virgil and this anonymous rhymer, I can recall no verse about cheese.
Alarms and Discursions G. K. Chesterton

The Pantiles are still the resort of the idle, but of the anonymous rather than famous variety.
Highways & Byways in Sussex E.V. Lucas

I opened it and found it to be anonymous, but I could see it came from a well-wisher.
The Memoires of Casanova, Complete Jacques Casanova de Seingalt

That he had accordingly done so, and to his utter surprise, found that his anonymous informant was right.
Valentine M’Clutchy, The Irish Agent William Carleton

adjective
from or by a person, author, etc, whose name is unknown or withheld: an anonymous letter
having no known name
lacking individual characteristics; unexceptional
(often capital) denoting an organization which provides help to applicants who remain anonymous: Alcoholics Anonymous
adj.

c.1600, from Late Latin anonymus, from Greek anonymos “without a name,” from an- “without” (see an- (1)) + onyma, Æolic dialectal form of onoma “name” (see name (n.)).