intransigent vs adamant

intransigent is not a noun while adamant is a noun.

Word	Noun	Adjective	Verb	Adverb
intransigent	No	Yes	No	No
adamant	Yes	Yes	No	No

As adjectives, intransigent and adamant are synonyms defined as:

intransigent and adamant: impervious to pleas, persuasion, requests, reason

Other synonyms of intransigent include adamantine, inexorable.

intransigent (noun)	adamant (noun)
	very hard native crystalline carbon valued as a gem

intransigent (adjective)	adamant (adjective)
impervious to pleas, persuasion, requests, reason	impervious to pleas, persuasion, requests, reason