degenerative
long
usual
abiding
accepted
accustomed
age-long
aged
ancient
antique
confirmed
constant
continuing
customary
deep-dyed
deep-fixed
deep-rooted
deep-seated
deep-set
deep-settled
diuturnal
durable
dyed-in-the-wool
enduring
established
evergreen
fast
fixed
habitual
habituated
hardened
hardy
immutable
implanted
inborn
inbred
incorrigible
inculcated
infixed
ingrained
instilled
intransient
inveterate
irreversible
lasting
lingering
long-established
long-lasting
acute
bodily
incurable
infectious
inflammatory
mental
neurological
persistent
pulmonary
respiratory
severe
widespread
Ionic
Masonic
Miltonic
Napoleonic
Panasonic
Platonic
allophonic
avionic
bubonic
catatonic
conic
demonic
diatonic
electronic
embryonic
ganglionic
gnomonic
harmonic
hedonic
hegemonic
histrionic
hyaluronic
hydroponic
hypersonic
hypertonic
ionic
ironic
isoelectronic
isotonic
laconic
leptonic
masonic
microelectronic
miltonic
mnemonic
monophonic
neoplatonic
nucleonic
ovonic
pharaonic
philharmonic
phonic
planktonic
platonic
plutonic
pneumonic
polyphonic
propionic
sardonic
sonic