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arduous▼(needing or using up much energy)adjective[UK: ˈɑː.djuəs] [US: ˈɑːr.dʒuːəs]
gruelling▼(so difficult or taxing as to make one exhausted)adjective[UK: ˈɡruːəl.ɪŋ] [US: ˈɡruːəl.ɪŋ]
weary [wearier, weariest]▼(tiresome)adjective[UK: ˈwɪə.ri] [US: ˈwɪ.ri]
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