For me, depression is all about :
unwillingness to move
lacking the ability to concentrate.
not wishing to speak.
not knowing what one desires.
not wanting to do anything.
never being free of suffering.
not comprehending my feelings.
not knowing how I ought to feel.
not smiling.
not laughing.
not a reader.
not going shopping.
not socializing.
not feeling capable.
not feeling productive.
not feeling needed.
not desiring sexual activity.
And finally, NOT knowing how to cure the problem and sometimes NOT even willing to make an effort to get healthier.
Just sad

We have no idea why we feel unhappy and alone.