Synonym of CONTEMPLATIVE

Answer: Option D

Morbid : characterized by an abnormal and unhealthy interest in disturbing and unpleasant subjects, especially death and disease.
Serious : demanding or characterized by careful consideration or application.
Calm : not showing or feeling nervousness, anger, or other strong emotions.
Thoughtful : absorbed in or involving thought.
Contemplative : expressing or involving prolonged thought.

Synonym of Contemplative is Thoughtful