pertinacious vs unyielding

pertinacious and unyielding both are adjectives.

Word	Noun	Adjective	Verb	Adverb
pertinacious	No	Yes	No	No
unyielding	No	Yes	No	No

As adjectives, pertinacious and unyielding are synonyms defined as:

Other synonyms of pertinacious include dogged, dour, persistent, tenacious.

pertinacious (adjective)	unyielding (adjective)
stubbornly unyielding	resistant to physical force or pressure
	stubbornly unyielding