1 [U] a feeling of unhappiness and lack of hope for the future:
I was overwhelmed by feelings of depression.
2 [C or U] a mental illness in which a person is very unhappy and anxious for long periods and cannot have a normal life during these periods:
Tiredness, loss of appetite and sleeping problems are all classic symptoms of depression.
I think i have mild depression. Mood swings. Irritability. "Moping around". Inablitity to concentrate. Memory Loss. Sadness. Crying alot. Unenthusiastic about school. Pessimistic about life.
oh well. above are some of the symtoms of depression in psychology. On the bright side, at least, i dont feel suicidal, have poor self-esteem or hallucinations. =p i considered myself still sane.