Synonyms of grump

1 Syllable
crab, bear, mope, sulk, grouch
2 Syllables
grouser, sulkers, gripers, grouches, sulked, pouting, sulking, moping, crabbing, grumped, sourpuss, grouched, moped, grumbler, crosspatch, whiner, griper, sulker
3 Syllables
sniveler, malcontent, curmudgeon, snivelers, complainer, complainers, mutterers, mutterer, faultfinder, bellyacher, sorehead