laborious vs grueling

laborious and grueling both are adjectives.

Word	Noun	Adjective	Verb	Adverb
laborious	No	Yes	No	No
grueling	No	Yes	No	No

As adjectives, laborious and grueling are synonyms defined as:

laborious and grueling: characterized by effort to the point of exhaustion; especially physical effort

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

laborious (adjective)	grueling (adjective)
characterized by effort to the point of exhaustion; especially physical effort	characterized by effort to the point of exhaustion; especially physical effort