[uhn-der-hwelm, -welm]
verb (used with object) Informal.
to fail to interest or astonish: After all the ballyhoo, most critics were underwhelmed by the movie.

1945–50; under- + (over)whelm

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underwhelm (ˌʌndəˈwɛlm)
(tr) to make no positive impact or impression on; disappoint
[C20: originally a humorous coinage based on overwhelm]

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

1956, a facetious play on overwhelm.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There is much anticipation of his arrival, but when he turns out to be a
  walrus, the kids are underwhelmed.
Upon breaking the seal, however, you may find yourself rather underwhelmed.
Going so far over the top that you're audience is underwhelmed.
Business travellers may want something more sober and could well be
  underwhelmed by the discounted price.
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