THESAURUS
disgruntled
against, annoyed, bad-tempered, beefing, bellyaching, bitching, browned off, complaining, complaintful, con, crabbing, crabby, cranky, croaking, cross, disappointed, disapprobatory, disapproving, discontent, discontented, disenchanted, disillusioned, displeased, dissatisfied, dissenting, envious, exasperated, faultfinding, fed up, griping, grouchy, grousing, growling, grumbling, grumpy, ill-humored, ill-tempered, indignant, irritated, low, malcontent, malcontented, moody, murmuring, muttering, opposed, opposing, out of humor, peeved, peevish, petulant, poor, put out, querulant, querulous, rebellious, resentful, restive, restless, sulky, sullen, testy, turned-off, unaccepting, unaccommodating, unappreciative, unapproving, uncomplimentary, uneasy, unfavorable, unfulfilled, ungratified, unhappy, unsatisfied, vexed, whiny
ROGET THESAURUS
disgruntled
Disappointment
N
disappointment, blighted hope, balk, blow, anticlimax, slip 'twixt cup and lip, nonfulfillment of one's hopes, sad disappointment, bitter disappointment, trick of fortune, afterclap, false expectation, vain expectation, miscalculation, fool's paradise, much cry and little wool, disappointed, disconcerted, aghast,
disgruntled, out of one's reckoning, the mountain labored and brought forth a mouse, parturiunt montes, nascitur ridiculus mus, diis aliter visum, the bubble burst, one's countenance falling.