die-hard vs inflexible

die-hard and inflexible both are adjectives.

Word	Noun	Adjective	Verb	Adverb
die-hard	No	Yes	No	No
inflexible	No	Yes	No	No

die-hard (adjective)	inflexible (adjective)
tradition-bound and obstinately opinionated	resistant to being bent
	incapable of change
	not making concessions
	incapable of adapting or changing to meet circumstances