obduracy vs unyieldingness

obduracy and unyieldingness both are nouns.

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

As nouns, obduracy and unyieldingness are synonyms defined as:

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

Other synonyms of obduracy include adamance.

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