That's a very patronizing response. When I say that depression often manifests as an unmotivated mental state, rather than the overt sadness or melancholy one might assume, I'm speaking from personal experience. As someone who has been medicated for it, I'm the last person who needs to be told that depression is a "serious illness".
Sorry, if I have been a bit harsh. It's just when people all the
time tell how depressed they are, but they're just in a pretty
normal bad mood, which vanishes the next day.
If you're then trying to explain people what a depression is, how it feels,
then they associate it with their "depressed" days.
