unfading (adj.)

• abiding
• aged
• amaranthine
• ancient
• antique
• changeless
• chronic
• colorfast
• constant
• continuing
• deathless
• double-dyed
• durable
• enduring
• evergreen
• everlasting
• fast
• firm
• fixed
• frozen
• hardy
• immobile
• immortal
• immutable
• imperishable
• incorruptible
• indelible
• ingrained
• intact
• inveterate
• inviolate
• lasting
• long-lasting
• long-lived
• long-standing
• long-term
• macrobiotic
• perdurable
• perennial
• permanent
• perpetual
• persistent
• persisting
• quiescent
• remaining
• rigid
• solid
• stable
• static
• stationary
• steadfast
• sustained
• torpid
• tough
• unaltered
• unchangeable
• unchanged
• unchanging
• unchecked
• undying
• unfailing
• unvaried
• unvarying
• vital