All 12 Uses of

morbid
in
The Scarlet Letter

Her prison-door was thrown open, and she came forth into the sunshine, which, falling on all alike, seemed, to her sick and morbid heart, as if meant for no other purpose than to reveal the scarlet letter on her breast.
p. 73.1

morbid = unhealthy

Whether from commiseration for a woman of so miserable a destiny; or from the morbid curiosity that gives a fictitious value even to common or worthless things; or by whatever other intangible circumstance was then, as now, sufficient to bestow, on some persons, what others might seek in vain; or because Hester really filled a gap which must otherwise have remained vacant; it is certain that she had ready and fairly requited employment for as many hours as she saw fit to occupy with…
p. 77.3

Her mother, with a morbid purpose that may be better understood hereafter, had bought the richest tissues that could be procured, and allowed her imaginative faculty its full play in the arrangement and decoration of the dresses which the child wore before the public eye.
p. 84.3

The mother herself—as if the red ignominy were so deeply scorched into her brain that all her conceptions assumed its form—had carefully wrought out the similitude, lavishing many hours of morbid ingenuity to create an analogy between the object of her affection and the emblem of her guilt and torture.
p. 95.2

Yet Mr. Dimmesdale would perhaps have seen this individual's character more perfectly, if a certain morbidness, to which sick hearts are liable, had not rendered him suspicious of all mankind.
p. 120.7

morbidness = unhealthy thinking

In such a case, it could only be the symptom of a highly disordered mental state, when a man, rendered morbidly self-contemplative by long, intense, and secret pain, had extended his egotism over the whole expanse of nature, until the firmament itself should appear no more than a fitting page for his soul's history and fate.
p. 143.9

morbidly = in an unhealthy manner

Since that wretched epoch, he had watched with morbid zeal and minuteness, not his acts—for those it was easy to arrange—but each breath of emotion, and his every thought.
p. 187.2

This morbid meddling of conscience with an immaterial matter betokened, it is to be feared, no genuine and steadfast penitence, but something doubtful, something that might be deeply wrong beneath.†
p. 78.5

For, as it was impossible to assign a reason for such distrust and abhorrence, so Mr. Dimmesdale, conscious that the poison of one morbid spot was infecting his heart's entire substance, attributed all his presentiments to no other cause.†
p. 130.7

It grovelled helpless on the ground, even while his intellectual faculties retained their pristine strength, or had perhaps acquired a morbid energy, which disease only could have given them.†
p. 147.3

Men of uncommon intellect, who have grown morbid, possess this occasional power of mighty effort, into which they throw the life of many days and then are lifeless for as many more.†
p. 223.2

Definitions:

(1) (morbid as in: a morbid curiosity)
suggesting death and decay; or an unhealthy interest in disturbing thoughts -- such as of death or cruelty
(2) (morbid as in: morbidly obese)
unhealthy or related to disease -- especially of a serious long-term illness

(The form, morbidity refers to a disease, and form morbidities refers to the number of people affected by a disease.)