its more complicated then the word "depressed" I only use that word because its shorter than saying "I'm so sad that i feel nothing and i smile everyday so people don't worry about me, I laugh as loud as possible because I don't want my laugh to go away, I try to make other people laugh so they wont feel the same way, and I'm tired of people not liking me for who I am so I change who I am to make friends in the last days, forgetting who I was in the first place, and I will do anything to make other peoples happiness fill my emptiness. the new me is me, I don't know who else I would be..." so the next time someone says they are depressed, don't just acknowledge it and forget the next day.
a huge thanks to uhh_this_is_a_person