rock-ribbed vs inflexible

rock-ribbed and inflexible both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rock-ribbed	No	Yes	No	No
inflexible	No	Yes	No	No

rock-ribbed (adjective)	inflexible (adjective)
tradition-bound and obstinately opinionated	resistant to being bent
abounding in or bordered by rocky cliffs or scarps	incapable of change
	not making concessions
	incapable of adapting or changing to meet circumstances