backbreaking vs toilsome

backbreaking and toilsome both are adjectives.

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

As adjectives, backbreaking and toilsome are synonyms defined as:

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

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

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