Strong's Concordance

Original word: ἀμαράντινος
Transliteration: amarantinos
Definition (short): unfading
Definition (full): unfading

NAS Exhaustive Concordance

Word Origin: from amarantos
Definition: unfading
NASB Translation: unfading (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From amarantos; "amaranthine", i.e. (by implication) fadeless -- that fadeth not away.

see GREEK amarantos

KJV: And when the chief Shepherd shall appear, ye shall receive a crown of glory that fadeth not away.
NASB: And when the Chief Shepherd appears, you will receive the unfading crown of glory.