challenging

chal|leng|ing /tʃ'ælɪndʒɪŋ/
1 [ADJ]
A challenging task or job requires great effort and determination.
Mike found a challenging job as a computer programmer...
I'm ready to do all those things which are more challenging.
= demanding
2 [ADJ] usu ADJ n
If you do something in a challenging way, you seem to be inviting people to argue with you or compete against you in some way.
Mona gave him a challenging look.
= defiant

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