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gruelling▼(so difficult or taxing as to make one exhausted)adjective[UK: ˈɡruːəl.ɪŋ] [US: ˈɡruːəl.ɪŋ]
tiring▼(that tires or tire)adjective[UK: ˈtaɪər.ɪŋ] [US: ˈtaɪr.ɪŋ]
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