Disappointment

google

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late Middle English (in the sense ‘deprive of a position’): from Old French desappointer .

wiktionary

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disappoint +‎  -ment

etymonline

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disappointment (n.)

1610s, "defeat or failure of hope or expectation," from French désappointement or else a native formation from disappoint + -ment. Meaning "feeling of being disappointed" is from 1756. Meaning "a thing that disappoints" is from 1756.