IRASCIBLE

easily angered

prone to tempermental outbursts

quickily aroused to anger
SYN - choleric, hotheaded, short-temper

characterized by anger
ANT - good-natured
"An irascible response."

"It was during this irascible outburst that she finally was able to realize she did not want to be with him."

"How had he, usually a calm person, became so irascible lately."

"He couldn't stand how irascible she was - they would have the littlest disagreement and it would escalate into a full-scale shouting match."

"She had been afraid to bring it up because of his history of being irascible."