Crossword Genius

Laborious, gruelling (7)

Ross

I believe the answer is:

arduous

I believe this is a double definition.

'laborious' is the first definition.
(synonyms)

'gruelling' is the second definition.
(synonyms)

(Other definitions for arduous that I've seen before include "Punishing" , "Requiring hard work" , "Extremely taxing" , "Burdensome" , "Requiring great effort" .)

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