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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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Example sentences
Someone who really scares you, whom you would not dare disappoint.
It is not the first, nor will it be the last, to disappoint.
And to the great disappoint of some, no sign of life of any kind.
Leaving the ocean view to drive inland in search of more ice will not
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