verb (used with object)
to fail to fulfill the expectations or wishes of: His gross ingratitude disappointed us.
to defeat the fulfillment of (hopes, plans, etc.); thwart; frustrate: to be disappointed in love.
verb (used without object)
to bring or cause disappointment.

1400–50; late Middle English < Middle French desappointer. See dis-1, appoint

disappointer, noun

1. sadden, disillusion, dishearten, disenchant.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disappoint (ˌdɪsəˈpɔɪnt)
1.  to fail to meet the expectations, hopes, desires, or standards of; let down
2.  to prevent the fulfilment of (a plan, intention, etc); frustrate; thwart
[C15 (originally meaning: to remove from office): from Old French desapointier; see dis-1, appoint]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

early 15c., from M.Fr. desappointer "undo the appointment, remove from office," from des- "dis" + appointer "appoint." Modern sense of "to frustrate expectations" (late 15c.) is from secondary meaning of "fail to keep an appointment." Related: Disappointing.
Online Etymology Dictionary, © 2010 Douglas Harper
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