morbidity

nouns

the relative incidence of a particular disease
morbidity
is a type of (narrower)
the relative frequency of occurrence of something
incidence, relative incidence
an abnormally gloomy or unhealthy state of mind
"his fear of being alone verges on morbidity"
morbidity, morbidness
is derived from
morbid
the quality of being unhealthful and generally bad for you
morbidity, morbidness, unwholesomeness
is derived from
morbid