Source : Webster's Revised Unabridged Dictionary (1913)

Untidy \Un*ti"dy\, a.
   1. Unseasonable; untimely. [Obs.] ``Untidy tales.'' --Piers
      Plowman.

   2. Not tidy or neat; slovenly. -- {Un*ti"di*ly}, adv. --
      {Un*ti"di*ness}, n.

Source : WordNet®

untidy
     adj 1: not neat and tidy; "careless and untidy in her personal
            habits"; "an untidy living room"; "untidy and casual
            about money" [ant: {tidy}]
     2: careless and slovenly
     [also: {untidied}, {untidiest}, {untidier}]