irascible

ärhäkkä, äreä, äkeä

pikavihainen Easily provoked to outbursts of anger; irritable.
1809, w:Washington Irving|Washington Irving, Knickerbockers History of New York'', ch. 16:

. . . the surly and irascible passions which, like belligerent powers, lie encamped around the heart.

I am naturally irascible, and if I could have shaken this negative gentleman vigorously, the relief would have been immense.

. . . a never idle man of great physical strength and extremely irascible—did he not fling a badly baked plum pudding through the window upon Xmas Day?

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.