1) About to blow 2) About to erupt 3) About to explode 4) About to go off 5) About to go through the roof 6) About to lose it 7) All bent out of shape 8) All steamed up 9) All worked up 10) Angered 11) Angry 12) Angry and then some 13) Angry buccaneer loses head 14) Angry, annoyed 15) Annoyed 16) Apt to go through the roof Found on https://www.crosswordclues.com/clue/irate
I·rate' adjective [ Latin iratus , from irasci to be angry. See Ire .] Angry; incensed; enraged. [ Recent] « The irate colonel . . . stood speechless.» Thackeray. « Mr. Jaggers suddenly became most irate .» Dickens. Found on http://www.encyclo.co.uk/webster/I/95
irate 1. Extremely angry; enraged; furious, indignant, irate, ireful, wrathful. 2. Characterized or occasioned by anger; such as, an irate phone call. 3. Showing or typical of great anger. Found on http://www.wordinfo.info/words/index/info/view_unit/1087/