Source : Webster's Revised Unabridged Dictionary (1913)

Irate \I*rate"\, a. [L. iratus, fr. irasci to be angry. See
   {Ire}.]
   Angry; incensed; enraged. [Recent]

         The irate colonel . . . stood speechless. --Thackeray.

         Mr. Jaggers suddenly became most irate.  --Dickens.

Source : WordNet®

irate
     adj : feeling or showing extreme anger; "irate protesters";
           "ireful words" [syn: {ireful}]