Synonyms and related words :
beefing, bellyaching, bitching, complaining, complaintful, crabbing, crabby, cranky, croaking, disappointed, discontented, disgruntled, displeased, dissatisfied, envious, faultfinding, griping, grousing, growling, gruff, grumbling, grumbly, grumpish, grumpy, malcontent, malcontented, murmuring, muttering, out of humor, peevish, petulant, querulant, querulous, rebellious, resentful, restive, restless, sulky, unaccepting, unaccommodating, uneasy, unfulfilled, ungratified, unhappy, unsatisfied, whiny