uncompromising vs inflexible

uncompromising and inflexible both are adjectives.

Word	Noun	Adjective	Verb	Adverb
uncompromising	No	Yes	No	No
inflexible	No	Yes	No	No

As adjectives, uncompromising and inflexible are synonyms defined as:

Other synonyms of uncompromising include sturdy.

uncompromising (adjective)	inflexible (adjective)
not making concessions	resistant to being bent
	incapable of change
	not making concessions
	incapable of adapting or changing to meet circumstances