toilsome vs gruelling

toilsome and gruelling both are adjectives.

Word	Noun	Adjective	Verb	Adverb
toilsome	No	Yes	No	No
gruelling	No	Yes	No	No

As adjectives, toilsome and gruelling are synonyms defined as:

toilsome and gruelling: characterized by effort to the point of exhaustion; especially physical effort

Other synonyms of toilsome include arduous, backbreaking, grueling, hard, heavy, laborious, operose, punishing.

toilsome (adjective)	gruelling (adjective)
characterized by effort to the point of exhaustion; especially physical effort	characterized by effort to the point of exhaustion; especially physical effort