Word:   
Definitions of challenging:
  • adjective:   disturbingly provocative
  • adjective:   stimulating interest or thought
    Example: "A challenging hypothesis"
  • adjective:   requiring full use of your abilities or resources
    Example: "Performed the most challenging task without a mistake"

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Search for challenging at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See challenging used in context: 12 rhymes, several books and articles.

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