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arduous▼(needing or using up much energy)adjective[UK: ˈɑː.djuəs] [US: ˈɑːr.dʒuːəs]
dour [dourer, dourest]▼(stern, harsh and forbidding)adjective[UK: dʊə(r)] [US: ˈdaʊər]
rigorous▼(showing, causing or favoring rigor)adjective[UK: ˈrɪ.ɡə.rəs] [US: ˈrɪ.ɡə.rəs]The accreditation process is rigorous. = El proceso de acreditación es riguroso.
trying▼(Difficult to endure; arduous)adjective[UK: ˈtraɪ.ɪŋ] [US: ˈtraɪ.ɪŋ]
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