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Meaning of underwhelm

un•der•whelm

Pronunciation: (un"dur-hwelm', -welm'), [key]
— v.t. Informal.
  1. to fail to interest or astonish: After all the ballyhoo, most critics were underwhelmed by the movie.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.