The Collaborative International Dictionary of English v.0.48:
Irate \I*rate"\, a. [L. iratus, fr. irasci to be angry. See Ire.] Angry; incensed; enraged. [Recent] [1913 Webster] The irate colonel . . . stood speechless. --Thackeray. [1913 Webster] Mr. Jaggers suddenly became most irate. --Dickens. [1913 Webster]WordNet (r) 3.0 (2006):
irate adj 1: feeling or showing extreme anger; "irate protesters"; "ireful words" [syn: irate, ireful]