Crossword Genius

Harsh (7)

Ross

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4 5 6

7

9

(Other definitions for arduous that I've seen before include "Toilsome" , "Difficult, laborious" , "Steep - hard" , "Hard to endure" , "Extremely taxing" .)

I've seen this clue in The Star Tribune, the Evening Standard, The Telegraph, The Mirror, the Penny Press and The Guardian.
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