morbid
US /ˈmɔːr.bɪd/
UK /ˈmɔːr.bɪd/

1.
characterized by or appealing to an abnormal and unhealthy interest in disturbing and unpleasant subjects, especially death and disease
:
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He has a morbid fascination with true crime stories.
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The novel explores the character's morbid thoughts about death.
2.
of the nature of or indicating disease
:
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The doctor observed some morbid changes in the tissue.
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Morbid obesity is a serious health condition.