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