morbidity

n. unhealthiness; state of being diseased; gloominess, depression; state of being gruesome or repugnant

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Noun
1. the ratio of deaths in an area to the population of that area; expressed per 1000 per year
(synonym) deathrate, death rate, mortality, mortality rate, fatality rate
(hypernym) rate
(hyponym) infant deathrate, infant mortality, infant mortality rate
2. the relative incidence of a particular disease
(hypernym) incidence, relative incidence
3. the quality of being unhealthful and generally bad for you
(synonym) unwholesomeness, morbidness
(hypernym) quality
(hyponym) harmfulness, noisomeness, noxiousness

(n.)
The quality or state of being morbid.
  

(n.)
Morbid quality; disease; sickness.
  

(n.)
Amount of disease; sick rate.
  

Illness, disease.

A disease or the incidence of disease within a population. Morbidity also refers to adverse effects caused by a treatment.