Adjectives

(s)morbidsuggesting an unhealthy mental state“morbid interest in death”, “morbid curiosity”
(s)ghoulish, morbidsuggesting the horror of death and decay“morbid details”
(s)diseased, morbid, pathologic, pathologicalcaused by or altered by or manifesting disease or pathology“diseased tonsils”, “a morbid growth”, “pathologic tissue”, “pathological bodily processes”