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 gruelling
 
 
 
       
        
         | 1. | (satellite adjective) characterized by toilsome effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace" |  
	 |  | Synonyms: arduous, backbreaking, grueling, hard, heavy, laborious, labourious, punishing, toilsome |  | 
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