disappoint
v.-
1 to fail to fulfil a hope (v.) B2 Upper Intermediate Formalto not happen in the way that was planned or hoped for.
to fail to fulfil or satisfy a hope, expectation, or plan. Often takes an abstract noun as the object rather than a person.
ExampleThe low sales figures disappointed our hopes for a quick expansion.
ExampleThe final results of the clinical trial disappointed the researchers' expectations, as the drug failed to show a significant improvement over the placebo.
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2 to prevent a plan (v.) C2 Proficiency Literary Archaicto stop a plan from working or happening.
to defeat or frustrate a plan, intention, or design. This sense is increasingly rare in modern speech but persists in formal or literary contexts.
ExampleThe heavy rain disappointed their plans for an outdoor wedding.
ExampleThe sudden arrival of the guards disappointed his attempt to escape through the narrow window of the cell.
From Middle French desapointer (compare French désappointer). The word originally meant to "dispossess of appointed office", and eventually broadened to mean "to frustrate the expectations or desires of" and "defeat the realization or fulfillment of".