unyieldingness vs obduracy

unyieldingness and obduracy both are nouns.

Word	Noun	Adjective	Verb	Adverb
unyieldingness	Yes	No	No	No
obduracy	Yes	No	No	No

As nouns, unyieldingness and obduracy are synonyms defined as:

unyieldingness and obduracy: resoluteness by virtue of being unyielding and inflexible

Other synonyms of unyieldingness include adamance.

unyieldingness (noun)	obduracy (noun)
resoluteness by virtue of being unyielding and inflexible	resoluteness by virtue of being unyielding and inflexible