challenging

adjective

requiring full use of your abilities or resources
自身の能力または資質をめいっぱい使う必要のある
- ambitious schedule
  大掛かりな計画
- performed the most challenging task without a mistake
  間違いなしに最も挑戦的なことを行った
disturbingly provocative
妙に刺激する
- an intriguing smile
  魅惑的な微笑
stimulating interest or thought
刺激的な関心を促すさま
- a challenging hypothesis
  思考を刺激する仮説
- a thought-provoking book
  示唆に富む本

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