challenging
/ˈtʃæləndʒɪŋ/
adjective
- Difficult in a way that tests your ability or determination.
- The math problem was challenging, but she solved it after an hour.
- Learning a new language can be challenging, but it is also rewarding.
- Climbing the mountain was a challenging experience for the whole team.
- Requiring full use of your abilities; demanding effort or thought.
- The teacher gave us a challenging project that took weeks to complete.
- Running a marathon is physically challenging for most people.
- He enjoys challenging work that makes him think creatively.