Feelings of sadness or dissatisfaction when something you hoped for doesn't happen or isn't as good as expected.
From French 'désappointer,' formed from 'dis-' (negation) and 'appoint' (to assign or satisfy). The term emerged in the 16th century when it literally meant 'to undo an appointment.'
Disappointment is uniquely human—it requires both imagination (picturing a better outcome) and memory (comparing reality to expectations). Animals can feel frustrated, but disappointment needs that special gap between hope and reality.
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