Synonyms of grumbling

1 Syllable

sour

2 Syllables

whiny, grumpy, grouchier, grumbly, carping, grouchy, putout, grumpier, ennuied, fed-up, put-out, quibbling, moaning, irked

3 Syllables

complaining, petulant, querulous, unsated

4 Syllables

dissatisfied, irritable, ungrateful, unappeased, unassuaged, ill-humored

6 Syllables

oversensitive