immortal
abiding
amaranthine
embalmed
eternal
ever-fresh
everlasting
fadeless
frozen
imperishable
impregnable
incorruptible
indelible
indestructible
ineffaceable
ineradicable
inexpugnable
inextinguishable
invincible
invulnerable
lasting
never-dying
never-ending
nonperishable
permanent
persisting
quenchless
timeless
undampable
undestroyable
undying
unending
unfading
unquenchable
boundless
changeless
filial
godlike
knightly
purer
self-sacrificing
true
unchangeable
unconquerable
unshaken
unswerving
untiring
well-earned