rigorous vs demanding

rigorous and demanding both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rigorous	No	Yes	No	No
demanding	No	Yes	No	No

rigorous (adjective)	demanding (adjective)
demanding strict attention to rules and procedures	requiring more than usually expected or thought due; especially great patience and effort and skill
rigidly accurate; allowing no deviation from a standard