clinical depression
noun [ U ] uk/ˌklɪn.ɪ.kəl dɪˈpreʃ.ən/ us/ˌklɪn.ɪ.kəl dɪˈpreʃ.ən/
抑郁症
a mental illness that causes feelings of sadness and loss of hope, changes in sleeping and eating habits, loss of interest in your usual activities, and pains that have no physical explanation