morbid (adj.) Look up morbid at Dictionary.com
1650s, "of the nature of a disease, indicative of a disease," from Latin morbidus "diseased," from morbus "sickness, disease, ailment, illness," according to de Vaan perhaps connected to the root of mori "to die," as "looking like death" (see mortal (adj.)). Transferred use, of mental states, is from 1777. Related: Morbidly; morbidness.