This is as good a one-word description of depression as any. Churchill's metaphor has always struck me as slightly misleading in one sense (although it's excellent in others): depression is not a thing; not even a black one. It is a lack, of motivation, energy, joy, imagination; you don't wake up and feel depressed, you wake up depressed and feel terrible, but the depression is hidden, only evident in retrospect, just as you don't tend to notice how quiet it is until a noise breaks the silence.
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