The Collaborative International Dictionary of English v.0.48:

intensifying \intensifying\ adj.
   increasing in strength or intensity. [Narrower terms:
   aggravating, exacerbating, exasperating ; {augmentative,
   enhancive; deepening(prenominal), heightening(prenominal)
   ] {moderating
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         How piercing is the sting of pride
         By want embittered and intensified.      --Longfellow.
   [1913 Webster]

WordNet (r) 3.0 (2006):

intensifying
    adj 1: increasing in strength or intensity [ant: moderating]