Wordnet 3.0
ADJECTIVE (1)
1. 
 being or having an unknown or unnamed source; 
- Example: "a poem by an unknown author"- Example: "corporations responsible to nameless owners"- Example: "an unnamed donor"[syn: nameless, unidentified, unknown, unnamed]
The Collaborative International Dictionary of English v.0.48:
Unnamed \Unnamed\
   See named.
WordNet (r) 3.0 (2006):
unnamed
    adj 1: being or having an unknown or unnamed source; "a poem by
           an unknown author"; "corporations responsible to nameless
           owners"; "an unnamed donor" [syn: nameless,
           unidentified, unknown, unnamed]