anonymous (adj.)

c. 1600, "without a name;" 1670s, "published under no name, of unknown authorship," from Late Latin anonymus, from Greek anonymos "without a name," from an- "without" (see an- (1)) + onyma, Æolic dialectal form of onoma "name" (from PIE root *no-men- "name").

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Definitions of anonymous from WordNet

anonymous (adj.)
having no known name or identity or known source;
an anonymous gift
anonymous authors
anonymous donors
Synonyms: anon.
anonymous (adj.)
not known or lacking marked individuality;
brown anonymous houses
anonymous bureaucrats in the Civil Service