The noun morbidity means "the quality of being unhealthful." If you can't watch your sister's morbidity get any worse, you might sign her up with a nutritionist and a personal trainer.

Morbidity comes from the word morbid, which means "or of relating to disease," like the number of cases of any disease in an areas — morbidity rates for polio that plummeted in the 20th century. Morbidity can also mean "fixated on death or having an abnormally gloomy state of mind," like the increasing morbidity of an older person whose family and friends have all passed on.

Definitions of morbidity

n the quality of being unhealthful and generally bad for you

morbidness, unwholesomeness
the quality of being beneficial and generally good for you
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harmfulness, noisomeness, noxiousness
the quality of being noxious
perniciousness, toxicity
grave harmfulness or deadliness
deadliness, lethality
the quality of being deadly
jejuneness, jejunity
quality of lacking nutritive value
putrescence, rottenness
the quality of rotting and becoming putrid
the quality of promoting poor health
the quality of being able to cause death or fatal disasters
insalubriousness, insalubrity
the quality of being insalubrious and debilitating
Type of:
an essential and distinguishing attribute of something or someone

n the relative incidence of a particular disease

Type of:
incidence, relative incidence
the relative frequency of occurrence of something

n an abnormally gloomy or unhealthy state of mind

“his fear of being alone verges on morbidity
Type of:
cognitive state, state of mind
the state of a person's cognitive processes

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