exhausting, demanding, tiring, severe, taxing, punishing, strenuous, arduous
she worked a gruelling 18 hours shift at the restaurant.
The man was in gruelling pain after he was attacked by the great white shark.
The spelling gruelling is a variant, but the US spelling of the adjective is grueling (demanding, arduous).
Very tiring or exhaustgrueling means tierd or tiring
To cope with her gruelling schedule she must maintain a very high level of fitness.
arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome
They are synonyms.
Synonyms
Relative and kin are synonyms.
They are synonyms.
The word is spelt gruelling in British English and grueling in American English.
synonyms