Cartilaginous

a.	1.	Of or pertaining to cartilage; gristly; firm and tough like cartilage.
	2.	(Zool.) Having the skeleton in the state of cartilage, the bones containing little or no calcareous matter; said of certain fishes, as the sturgeon and the sharks.

Adj.

1.

cartilaginous - difficult to chew Synonyms: gristly, rubbery

gristly, rubbery, tough