disappointment

n.

1. The state of being disappointed

   dissatisfaction, nonfulfillment, unfulfillment, frustration, chagrin, thwarted expectations, miscarriage of plans, defeat, failure, lack of success, despondency, displeasure, distress, hope deferred, discouragement, let down, disillusionment, foiling, nonsuccess, mortification, vain expectation, bafflement, disillusion, setback, discontent, blighted hope, dashed hope, balking; see also defeat 3, regret 1.

   Antonyms satisfaction, success*, fulfillment. *

2. A person or thing that disappoints

   letdown, miscarriage, misfortune, mischance, calamity, blunder, inefficacy, setback, downfall, slip, defeat, impasse, mishap, error, mistake, discouragement, frustration, obstacle, check, balk, abortion, bungle, slip 'twixt the cup and the lip, faux pas, cold comfort, labor in vain, miscalculation, miss, failure, shipwreck, fiasco, no go*, blind alley*, fizzle*, washout*, lemon*, dud*, flash in the pan*, bust*, frost*, false alarm*, non-starter*; see also failure 1, 2.

   Antonyms achievement*, successful venture, success.