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arduous▼(needing or using up much energy)adjective[UK: ˈɑː.djuəs] [US: ˈɑːr.dʒuːəs]
hard [harder, hardest]▼(severe)adjective[UK: hɑːd] [US: ˈhɑːrd]
strenuous▼(requiring great exertion)adjective[UK: ˈstre.njʊəs] [US: ˈstre.njuːəs]
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