unbending vs rigid

unbending and rigid both are adjectives.

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

As adjectives, unbending and rigid are synonyms defined as:

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

Other synonyms of unbending include inflexible.

unbending (adjective)	rigid (adjective)
incapable of adapting or changing to meet circumstances	designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
	incapable of or resistant to bending
	incapable of compromise or flexibility
	fixed and unmoving
	incapable of adapting or changing to meet circumstances