challenging · adjective /ˈtʃæl.ən.dʒɪŋ/Full view
Nouns: challenge, challenger
Adjectives: challenged, challenging
Verbs: challenge
B1 difficult, in a way that tests your ability or determination
Dictionary example:

This has been a challenging time for us all.

Learner example:

Like cavaliers we ride across the country looking for adventures and challenging activities. (Preliminary English Test; B1; Spanish)

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