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dullness▼(quality of being slow to understand)noun[UK: ˈdʌl.nəs] [US: ˈdʌl.nəs]
hebetude▼(mental lethargy or dullness)noun[UK: ˈhe.bɪ.tjʊd] [US: ˈhe.bɪ.ˌtuːd]
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