Definition of Challenging

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:
challenges
challengingly