continuous
uninterrupted
ageless
amaranthine
articulated
catenated
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
immortal
incessant
indestructible
infinite
interminable
joined
jointless
linked
machine gun
monotonous
never-ceasing
never-ending
nonstop
nonterminating
nonterminous
olamic
oscillating
perdurable
perennial
frantic
fruitless
furious
insistent
intermittent
relentless
steady
thunderous
unceasing
unending