sick person
sufferer
diseased person
mal
bout
Ockelbo disease
Karelian fever
curse
torment
event
condition
nosogenic
patho-
noso-
spoonie
invalidism
superacute
incurable
pathoclinical
creeping crud
fever
stricken
amoebosis
hugger-mugger
afflicted
upside down
clergyman's sore throat
indisposition
-otic
down with
pathic
postinfection
contraction
extreme prejudice
treatment
housebound
homebound
shut-in
suffer from
piss out one's ass
simplexity
gastropathy
amoebiasis
natural causes
sick as a parrot
medical condition
hyperpathogenic
polypathia
morbus
Uncle Dick
illness
posthospitalization
under the weather
unwell
peaked
seedy
idiopath
illsome
onsetter
green
indisposed
ill
poorly
ailing
hyperacute
ill health
infected
sickly
zymotic
pathologicoclinical
hyperuricemic
malaised
diseasedness
neuroinfection
climax
death warmed over
prey
pharyngitic
clinicohistological
affected
-ist
pathosis
pneumonitic
fever-ridden
plague
sequela
galactorrheic
ultrasevere
affliction
postinfectional
befevered
pathological state
diseased
polypathology
itis
phthisic
carditic
postpharyngitic
nosogenic
superacute
pathoclinical
stricken
afflicted
upside down
pathic
postinfection
housebound
homebound
shut-in
sick as a parrot
hyperpathogenic
Uncle Dick
posthospitalization
under the weather
unwell
peaked
seedy
illsome
green
indisposed
ill
poorly
ailing
hyperacute
infected
sickly
zymotic
pathologicoclinical
malaised
pharyngitic
clinicohistological
pneumonitic
fever-ridden
galactorrheic
ultrasevere
postinfectional
befevered
diseased
carditic
postpharyngitic
upside down
postinfection
sick person
sufferer
diseased person
mal
bout
Ockelbo disease
Karelian fever
curse
torment
event
condition
spoonie
invalidism
incurable
creeping crud
fever
amoebosis
hugger-mugger
clergyman's sore throat
indisposition
contraction
extreme prejudice
treatment
simplexity
gastropathy
amoebiasis
natural causes
medical condition
polypathia
morbus
illness
idiopath
onsetter
ill health
hyperuricemic
diseasedness
neuroinfection
climax
death warmed over
prey
affected
pathosis
sequela
affliction
pathological state
polypathology
itis
phthisic
ill
suffer from
piss out one's ass
plague
English words for 'serious illness'
As you may have noticed, above you will find words for "serious illness". Hover the mouse over the word you'd like to know more about to view its definition. Click 
to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.
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frighten
a wry face.
Not arguable
wholeheartedness
to duck one's head
sand bar
to burn out
whopping.
direct product
acclaim
public-private partnership
Greenland
tentative reservation
tension.
having two feet
old edition
abstruseness
to coddle
Characterised or marked by clutter
foreleg
liquid foundation
algebraic equation
low-carbohydrate
secret method
bipyridyl
gutless
pendency
morning and evening
winged
windshield
largely
tongue
missile
company union
hinder.
intruder
fanciful
genuine article
tooth
to forget to mention
high-pitched
new face
radiant.
to make merry
rack
contents
artless
admonition
significant
valuable