noun

a habitually grumpy person.

rock’s foremost poet and ill-mannered grouch

grumbler,complainer,moaner,discontent,malcontent,fault-finder,carper,grumpy person,miserable person,moper,pessimist,prophet of doom,grump,sourpuss,crosspatch,bear with a sore head,grouser,wet blanket,party pooper,doom merchant,griper,whinger,misery,sorehead,kvetcher

verb

voice one’s discontent ill-temperedly; grumble.

there’s not a lot to grouch about

grumble,complain,grouse,moan,whine,bleat,carp,cavil,grieve,sigh,mither,twine,beef,bellyache,bitch,sound off,kick up a fuss,kick up a stink,whinge,gripe,grizzle,chunter,create,kvetch,chirp