A. healthy
B. clever
C. upright
D. sickly
Morbid : characterized by an abnormal and unhealthy interest in disturbing and unpleasant subjects, especially death and disease.
Healthy : in a good physical or mental condition; in good health.
Clever : quick to understand, learn, and devise or apply ideas; intelligent.
Upright : (of a person) sitting or standing with the back straight.
Sickly : often ill; in poor health.
Antonym of Morbid is Healthy