adjective

having or showing a tendency to be quickly irritated or provoked.

an impatient motorist blaring his horn

irritated,annoyed,angry,testy,tetchy,snappy,cross,crabby,moody,grumpy,querulous,fretful,peevish,peeved,piqued,discontented,displeased,disgruntled,intolerant,short-tempered,quick-tempered,abrupt,curt,brusque,terse,short,aggravated,grouchy,narked,narky,ratty,eggy,shirty