suggesting an unhealthy mental state or attitude; unwholesomely gloomy, sensitive, extreme, etc.: a morbid interest in death. Antonyms: cheerful. affected by, caused by, causing, or characteristic of disease. Synonyms: sickly, sick, unhealthy, diseased, unwholesome.

No, morbid is an adjective (with meanings such as "of, relating to, or characteristic of disease" and "gruesome or grisly"). There are noun forms, such as morbidity ("an abnormal or unhealthy state of mind; especially, one marked by excessive gloom") and morbidness ("the quality or state of being morbid").

Something that is moribund is almost dead, like a moribund economy that has been stuck in a recession for years. In Latin, mori means "to die." You probably recognize this root in words like mortal, mortician, and mortuary.

(mɔːʳbɪd ) adjective. If you describe a person or their interest in something as morbid, you mean that they are very interested in unpleasant things, especially death, and you think this is strange. [disapproval]