arduousness

From arduous + -ness.

• (Received Pronunciation) IPA^(key): /ˈɑːdjuːəsnəs/

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arduousness (usually uncountable, plural arduousnesses)

1. The state of being arduous.
   • 2019 July 3, Mike D'Angelo, “Oscar Isaac and Ben Affleck blunder through a heavy heist in J.C. Chandor’s Triple Frontier”, in AV Club‎^[1], archived from the original on 21 November 2019:

     As it happens, the duo that made Triple Frontier boasts an impressive pedigree in cinematic arduousness.)

• (state of being arduous): arduity