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
  1. noun
    the quality of being unhealthful and generally bad for you
    synonyms: morbidness, unwholesomeness
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    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
  2. noun
    the relative incidence of a particular disease
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    type of:
    incidence, relative incidence
    the relative frequency of occurrence of something
  3. noun
    an abnormally gloomy or unhealthy state of mind
    “his fear of being alone verges on morbidity
    synonyms: morbidness
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    type of:
    cognitive state, state of mind
    the state of a person's cognitive processes
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