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challenging
mastery/ˈt͡ʃæl.ɪn.d͡ʒɪŋ/adjnoun
card 1 of 9 · fill in the blank
The hike was _____ challenging for the beginners, but they managed to finish it.
card 1 of 9 · fill in the blank
The hike was _____ challenging for the beginners, but they managed to finish it.