Source : Webster's Revised Unabridged Dictionary (1913)

Inversely \In*verse"ly\, adv.
   In an inverse order or manner; by inversion; -- opposed to
   {directly}.

   {Inversely proportional}. See {Directly proportional}, under
      {Directly}, and {Inversion}, 4.

Source : WordNet®

inversely
     adv : in an inverse or contrary manner; "inversely related";
           "wavelength and frequency are, of course, related
           reciprocally"- F.A.Geldard [syn: {reciprocally}]