demanding vs rigorous

demanding and rigorous both are adjectives.

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

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