constant of aberration
continuous
invariable
staunch
steadfast
unfailing
unflagging
uninterrupted
unswerving
abiding
accordant
active
age-long
aged
ageless
alike
ancient
antique
ardent
articulated
assiduous
atom
atomic mass
atomic number
atomic weight
automatic
balanced
beaten
catenated
ceaseless
changeless
chattering
chronic
clinging
close
coeternal
colorfast
committed
compliant
concatenated
confirmed
conforming
connected
conscientious
consistent
consonant
continual
continued
continuing
correspondent
cyclical
dateless
dedicated
deep-dyed
delicate
constancy
constantly
further
immediate
variable