Source : Webster's Revised Unabridged Dictionary (1913)

Intensify \In*ten"si*fy\, v. t. [imp. & p. p. {Intensified}; p.
   pr. & vb. n. {Intensifying}.] [Intense + -fly.]
   To render more intense; as, to intensify heat or cold; to
   intensify colors; to intensify a photographic negative; to
   intensify animosity. --Bacon.

         How piercing is the sting of pride By want embittered
         and intensified.                         --Longfellow.

Source : WordNet®

intensifying
     adj : increasing in strength or intensity [ant: {moderating}]