persistent vs unyielding

persistent and unyielding both are adjectives.

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

As adjectives, persistent and unyielding are synonyms defined as:

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

persistent (adjective)	unyielding (adjective)
retained; not shed	resistant to physical force or pressure
never-ceasing	stubbornly unyielding
stubbornly unyielding
continually recurring to the mind