Source : Webster's Revised Unabridged Dictionary (1913)

Topless \Top"less\, a.
   Having no top, or no visble fop; hence, fig.: very lofty;
   supreme; unequaled. `` The topless Apennines.'' ``Topless
   fortunes.'' --Beau. & Fl.

Source : WordNet®

topless
     adj 1: having no top; "a topless jar" [ant: {topped}]
     2: having the breasts uncovered or featuring such nudity;
        "topless waitresses"; "a topless cabaret" [syn: {bare-breasted},
         {braless}]