Crossword Genius

Harsh (6)

Ross

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(Other definitions for arduous that I've seen before include "Gruelling, strenuous" , "Requiring much effort" , "Steep; laborious" , "Extremely taxing" , "Requiring hard work" .)

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