imperishable
long
serviceable
abiding
adamantine
age-long
aged
ancient
antique
bulky
cartilaginous
changeless
chewy
chronic
cohesive
constant
continuing
coriaceous
dense
dependable
diuturnal
enduring
evergreen
fast
fibrous
firm
fixed
frozen
gristly
hard
hardy
heavy
immobile
immutable
indestructible
intact
intransient
inveterate
inviolate
lasting
leatherlike
leathery
long-lasting
long-lived
long-standing
long-term
longeval
longevous
compact
desirable
economical
efficient
expensive
flexible
inexpensive
lightweight
permanent
productive
profitable
reliable
robust
satisfactory
versatile
curable
incurable
nondurable
uninsurable
transitory
weak