Source : Webster's Revised Unabridged Dictionary (1913)

Qualitative \Qual"i*ta*tive\, a. [Cf. LL. gualitativus, F.
   qualitatif.]
   Relating to quality; having the character of quality. --
   {Qual"i*ta*tive*ly}, adv.

   {Qualitative analysis} (Chem.), analysis which merely
      determines the constituents of a substance without any
      regard to the quantity of each ingredient; -- contrasted
      with quantitative analysis.

Source : WordNet®

qualitatively
     adv : in a qualitative manner; "this discoloration qualitatively
           suggests that the substance is low in inorganic iron"