continuous
lasting
permanent
uninterrupted
abiding
ageless
articulated
catenated
ceaseless
chattering
coeternal
concatenated
connected
constant
continual
continued
continuing
cyclical
dateless
direct
endless
eternal
eterne
ever-being
ever-durable
ever-during
everlasting
everliving
featureless
gapless
immediate
immemorial
incessant
indefatigable
indestructible
infinite
interminable
joined
jointless
linked
machine gun
monotonous
never-ceasing
never-ending
nonstop
nonterminating
nonterminous
olamic
oscillating
perdurable
perennial
periodic
arduous
fruitless
inward
tireless
tremendous
unending
unrelenting
unremitting
ceasing
decreasing
fleecing
greasing
increasing
leasing
piecing
policing
releasing
subleasing