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noun
Extreme effortfulness.
synonym: arduousness.
is a specific kind of: effortfulness.
derivation: arduous | arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome | arduous, straining, strenuous | strenuous.
Polish: usilność
Find more on strenuousness elsewhere: etymology - rhymes - Wikipedia.
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