The Collaborative International Dictionary of English v.0.48:

Infuriate \In*fu"ri*ate\, v. t. [imp. & p. p. Infuriated; p.
   pr. & vb. n. Infuriating] [It. infuriato, p. p. of
   infuriare; pref. in- (L. in) + furia fury, L. furia. See
   Fury.]
   To render furious; to enrage; to exasperate.
   [1913 Webster]

         Those curls of entangled snakes with which Erinys is
         said to have infuriated Athemas and Ino. --Dr. H. More.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

infuriating \infuriating\ adj.
   extremely annoying or displeasing; causing intense anger.

   Syn: annoying, exasperating, maddening, vexing.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

infuriating
    adj 1: extremely annoying or displeasing; "his cavelier curtness
           of manner was exasperating"; "I've had an exasperating
           day"; "her infuriating indifference"; "the ceaseless
           tumult of the jukebox was maddening" [syn:
           exasperating, infuriating, maddening, vexing]