Crossword Genius

Gruelling (7)

Ross

I believe the answer is:

arduous

'gruelling' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for arduous that I've seen before include "Demanding great effort" , "Difficult, tiring" , "Extremely taxing" , "Steep - hard" , "Fatiguing (task)" .)

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