Source : Webster's Revised Unabridged Dictionary (1913)

Untitled \Un*ti"tled\, a.
   1. Not titled; having no title, or appellation of dignity or
      distinction. --Spenser.

   2. Being without title or right; not entitled. --Shak.

Source : WordNet®

untitled
     adj 1: not having a title or name; "his still untitled
            autobiography"; "many paintings are titled simply
            `Untitled'" [ant: {titled}]
     2: not of the nobility; "of ignoble (or ungentle) birth";
        "untitled civilians" [syn: {ignoble}, {ungentle}]