fibrous vs sinewy

fibrous and sinewy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fibrous	No	Yes	No	No
sinewy	No	Yes	No	No

As adjectives, fibrous and sinewy are synonyms defined as:

fibrous and sinewy: (of meat) full of sinews; especially impossible to chew

Other synonyms of fibrous include stringy, unchewable.

fibrous (adjective)	sinewy (adjective)
(of meat) full of sinews; especially impossible to chew	consisting of tendons or resembling a tendon
having or resembling fibers especially fibers used in making cordage such as those of jute	(of a person) possessing physical strength and weight; rugged and powerful
	(of meat) full of sinews; especially impossible to chew