Source : Webster's Revised Unabridged Dictionary (1913)

Baseless \Base"less\, a.
   Without a base; having no foundation or support. ``The
   baseless fabric of this vision.'' --Shak.

Source : WordNet®

baseless
     adj : without a basis in reason or fact; "baseless gossip"; "the
           allegations proved groundless"; "idle fears";
           "unfounded suspicions"; "unwarranted jealousy" [syn: {groundless},
            {idle}, {unfounded}, {unwarranted}]