constant
staunchly
staunchness
Sabbatarian
airtight
ardent
bigoted
calculable
close
committed
compact
consistent
creedbound
dedicated
dependable
devoted
dogmatic
dustproof
dusttight
evangelical
faithful
faithworthy
fast
firm
firm as Gibraltar
fixed
flinty
fundamentalist
gasproof
gastight
hermetic
hermetically sealed
hidebound
hyperorthodox
immovable
inflexible
infrangible
invincible
liege
lightproof
lighttight
literalist
literalistic
long-lasting
loyal
made of iron
marble-constant
oilproof
oiltight
precisianist
precisianistic
predictable
stanch
stanchly
check
staunched
staunches
staunching
avow
dauntless
disinterested
fanatical
fervent
intrepid
longtime
outspoken
resolute
stalwart
steadfast
true-hearted
uncompromising
unflinching
unshaken
zealous
launch
relaunch