adjective

irritable and bad-tempered; grumpy; complaining.

the old man grew sulky and grouchy

grumpy,cross,irritable,bad-tempered,crotchety,crabby,crabbed,cantankerous,curmudgeonly,moody,miserable,morose,sullen,surly,churlish,touchy,testy,tetchy,huffy,snappish,waspish,prickly,snappy,cranky,narky,ratty,eggy,like a bear with a sore head,whingy,soreheaded,sorehead,peckish,snaky,miffy