irascible

Etymology

From French irascible, from Late Latin īrāscibilis.

adj

1. Easily provoked to outbursts of anger; irritable.
   Alan Greenspan was on an irascible roll last week, first dissing everyone who holds a fixed-rate mortgage — suckers! — and later picking on folks who collect Social Security: Get back to work, Grandma. 29 February 2004, Daniel Kadlec, “Why He’s Meanspan”, in Time, archived from the original on 2013-06-30