What term describes an abnormal state of mind characterized by inactivity and disinterest in the environment?

The term that describes an abnormal state of mind characterized by inactivity and disinterest in the environment is depression. This mental health disorder is often marked by persistent feelings of sadness and a lack of interest or pleasure in activities that one previously enjoyed. Individuals experiencing depression may demonstrate significant levels of lethargy, prompting them to withdraw from social interactions and everyday tasks.

This state affects cognitive functioning, leading to difficulties in concentrating and making decisions, further contributing to the individual's inactivity and disinterest. In contrast, other mental health conditions, such as anxiety, schizophrenia, and bipolar disorder, have different characteristics and symptoms that do not align as closely with the description provided in the question. Anxiety typically involves heightened arousal and worry, schizophrenia may include delusions and hallucinations, and bipolar disorder is marked by extreme mood swings. Therefore, the option of depression accurately captures the essence of the described abnormal mental state.