continuous
uninterrupted
abiding
ageless
ardent
articulated
assiduous
catenated
ceaseless
changeless
chattering
coeternal
concatenated
connected
constant
continual
continued
continuing
cyclical
dateless
diligent
direct
dogged
endless
enduring
energetic
eternal
eterne
ever-being
ever-durable
ever-during
everlasting
everliving
faithful
featureless
fervent
gapless
hard
hardworking
immediate
immemorial
immutable
inalterable
incessant
incommutable
inconvertible
indefatigable
indefeasible
fruitless
long-continued
never-ceasing
painstaking
self-denying
self-sacrificing
strenuous
tireless
unabated
unceasing
unflagging
unflinching
unrelenting
unremitted
untiring
utmost
acquitting
admitting
befitting
bitting
committing
emitting
fitting
flitting
getting
gritting
hitting
knitting
omitting
permitting
pitting
quitting
refitting
resubmitting
sitting
slitting
spitting
splitting
submitting
transmitting
unwitting
witting