challenging

动词 challenge:

1. take exception to
   同义词：challenge, dispute, gainsay
2. issue a challenge to
   同义词：challenge
3. ask for identification
   同义词：challenge
4. raise a formal objection in a court of law
   同义词：challenge, take exception

形容词 challenging:

1. requiring full use of your abilities or resources
   同义词：ambitious
2. stimulating interest or thought
   同义词：thought-provoking
3. disturbingly provocative
   同义词：intriguing

1. A mentally challenging problem or puzzle.
   脑筋急转弯一个考验智力的问题或难题
2. A challenging course of study; a challenging role for an inexperienced performer.
   一门挑战性的课程; 给一个无经验的演员一个挑战性的角色
3. They challenged that company's supremacy in the field of electronics.
   他们挑战那家公司在电子学领域中占据的领先地位。
4. The tyrant's domination was challenged by the rebels.
   暴君的统治受到了反叛者的挑战。

chal.leng.ing

adj.（形容词）
Calling for full use of one`s abilities or resources in a difficult but stimulating effort:
挑战性的：在困难但振奋人心的+事件中要求充分运用某人的能力或才智的：
例句：
a challenging course of study; a challenging role for an inexperienced performer.
一门挑战性的课程；给一个无经验的演员一个挑战性的角色

Absorbing; intriguing:
引起兴趣的；令人深思的：
例句：
a challenging idea.
一个吸引人的观点