amaranthine vs unfading

amaranthine and unfading both are adjectives.

Word	Noun	Adjective	Verb	Adverb
amaranthine	No	Yes	No	No
unfading	No	Yes	No	No

As adjectives, amaranthine and unfading are synonyms defined as:

amaranthine (adjective)	unfading (adjective)
of or related to the amaranth plant	of an imaginary flower that never fades
of an imaginary flower that never fades