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Adjective: challenging  cha-lun-jing
  1. Requiring full use of your abilities or resources
    "performed the most challenging task without a mistake";
    - ambitious
  2. Stimulating interest or thought
    "a challenging hypothesis";
    - thought-provoking
  3. Disturbingly provocative
    - intriguing
Verb: challenge  cha-linj
  1. Question the truth or validity of; take exception to
    "She challenged his claims";
    - dispute, gainsay
  2. Issue a challenge to
    "Fischer challenged Spassky to a match"
  3. Ask for identification
    "The illegal immigrant was challenged by the border guard"
  4. (law) raise a formal objection in a court of law
    - take exception

See also: difficult, hard, provocative, stimulating

Type of: ask for, bespeak, bid, call for, contend, contest, invite, object, quest, repugn, request

Encyclopedia: Challenging

Challenge, California