inflexible vs unbending

inflexible and unbending both are adjectives.

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

As adjectives, inflexible and unbending are synonyms defined as:

inflexible and unbending: incapable of adapting or changing to meet circumstances

Other synonyms of inflexible include rigid.

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