Showing an unhealthy interest in unpleasant subjects like death or disease, or relating to disease or sickness.
From Latin 'morbidus' (diseased, sickly), derived from 'morbus' (disease). The English word retained both the literal medical meaning and developed the psychological meaning of an unhealthy preoccupation with dark topics.
The fascinating thing about 'morbid' is that it comes from 'morbus' (Latin for disease), so calling someone 'morbid' literally means their mind is 'diseased'—which shows how medieval thinkers viewed dark interests as mental illness, a judgment that still echoes in modern language.
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