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used in The Mysterious Benedict Society

only 1 use
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difficult  — especially requiring great effort over an extended period of time
  • Hauling Sticky and Constance to safety was an arduous, tricky business (and an unpleasant one, too, as Constance complained the whole time of Sticky's elbow in her ribs).
    p. 164.2

There are no more uses of "arduous" in The Mysterious Benedict Society.

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