ill
sick
bad
cacochymic
complaining
down
indisposed
infirm
invalid
invalidish
maladive
morbid
pathologic
pathological
peaked
peaked(predicate)
poorly
poorly(predicate)
puling
sickish
sicklied
sickly
sickness
unhealthy
unsound
unwell
valetudinarian
valetudinary
assailing
bailing
baling
curtailing
derailing
detailing
emailing
entailing
failing
flailing
grayling
hailing
impaling
inhaling
jailing
mailing
nailing
prevailing
railing
regaling
sailing
scaling
surveilling
tailing
trailing
unavailing
unfailing
unveiling
veiling
wailing
whaling
healthy
hearty
vigorous
well