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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
It disappoints me that an ad with such language actually has appeared.
The article disappoints with speculative inconclusiveness.
What disappoints me, about the comments and the article is no one seems to want
  to answer the question actually asked.
What disappoints me is not that he wants to raise taxes on the rich.
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