imperishable
abiding
age-long
aged
ageless
ancient
antique
ceaseless
chronic
coeternal
constant
continual
continuing
continuous
dateless
diuturnal
durable
endless
enduring
eternal
eterne
ever-being
ever-durable
ever-during
evergreen
everlasting
everliving
hardy
illimitable
immemorial
immutable
incessant
indestructible
infinite
interminable
intransient
inveterate
lasting
long-lasting
long-lived
long-standing
long-term
longeval
longevous
macrobiotic
never-ceasing
never-ending
nonstop
nonterminating
nonterminous
perdurability
perdurably
Antigua
Vera
bosses'
compressa
deque
honoribus
imperi
inalterable
injunctive
long-tried
many-faceted
multi-megaton
non-persistent
nullable
plusque
populari
sempiterna
terrace-like
uncustomary
unrecognizably