This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Retaining color, freshness, value, or usefulness.

adj. not losing color or value.

Not liable to lose strength or freshness of coloring.

Not liable to wither or decay.

adj. of an imaginary flower that never fades

"Armchair conquistadors rejoice, because the expansion adds a new area called Amaranthine -- a word that means "undying" or "unfading" -- and invites you to probe the origins of the original game's diabolic darkspawn."

immortal   

fading   

fast    fadeless    immarcescible    amaranthine    permanent   

never-fading    fadeless    deathless    imperishable    vernal