toilsome vs backbreaking

toilsome and backbreaking both are adjectives.

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

As adjectives, toilsome and backbreaking are synonyms defined as:

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

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

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