durable
imputrescible
indestructible
lasting
perdurable
permanent
undestroyable
amaranthine
deathless
embalmed
endless
ever-fresh
everlasting
fadeless
frozen
immortal
impregnable
incorruptible
indelible
ineffaceable
ineradicable
inexpugnable
inextinguishable
invincible
invulnerable
irrefragable
never-dying
nonperishable
quenchless
undampable
undying
unfading
unquenchable
all-pervading
celestial
changeless
earthly
immaterial
immutable
indivisible
ineffable
inestimable
posthumous
unchanging
well-earned
transient