Meaning

noun the relative incidence of a particular disease

noun an abnormally gloomy or unhealthy state of mind

noun the quality of being unhealthful and generally bad for you

originRecorded since 1721; from morbid + -ity, from Latin morbidus (“diseased”), from morbus (“disease”), from the root of morī (“to die”) or from Proto-Indo-European *mer- (“to rub, pound, wear away”).

Etymology from Wiktionary, CC BY-SA 3.0