For those who have been (or are) depressed, how would you describe it (to the extent that is possible)?

GuyWannaHelp
First and foremost, I am aware I am essentially asking the impossible here. From what I know of depression, the lack of true understanding from people closest to you is often one of the most difficult things. Often they do their absolute best to make you feel better, but they have not a clue what it is you actually feel like.

I am asking you to describe what depression meant (or means) for you; not in general. I never want to underestimate the severity of someone's depression, and I think learning how it is for others can help a lot (not only me, but many people).

Also, if you are currently dealing with depression, don't feel obligated to answer.
For those who have been (or are) depressed, how would you describe it (to the extent that is possible)?
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