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challenging
'challenging' - used as an adjective
1. requiring full use of your abilities or resources
performed the most challenging task without a mistake
 2. stimulating interest or thought
a challenging hypothesis
 3. disturbingly provocative
See also
  • difficult
  • hard
  • provocative
  • stimulating
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    Who Said that ?
    Why that would be like challenging Bing Crosby to a singing contest,wouldn't it? - Click here to find out.
    Fact of the day
    The rarest chocolate bar in the world is the Porcelana bar. There are only 20,000 of these bars produced a year, and they sell for $90 per pound.