"Feelings of being intensely sad, miserable, and/or hopeless. Some patients describe an absence of feelings and/or dysphoria; difficulty recovering from such moods; pessimism about the future; pervasive shame and/or guilt; feelings of inferior self-worth; and thoughts of suicide and suicidal behavior."
Adapted from American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. Fifth Edition. Washington, DC. American Psychiatric Association. 2013. Page 820.