Emily Dickinson Lexicon

MOR'BID, a. [L. morbidus, from morbus, a disease, from the root of morior, to die; W. marw, to die, from mar, laid flat. The sense of the verb then is to fall, fail or sink; Ir. marbh, W. marw, dead. In Ch. מרע is to be sick. Class Mr, No. 12.]

Diseased; sickly; not sound and healthful; as, morbid humor; a morbid constitution; a morbid state of the juices of a plant; a morbid sensibility.