He takes medicine every day because he suffers from depression.

He is suffering from depression.

This forest has a dense atmosphere.

I'm fed up with his gloomy attitude.

He was carrying a feeling of gloom.

His irresistible energy could be felt by everyone.

He fell into dejection.

He has been diagnosed with manic depression and is receiving treatment.

He likes to take a walk in the park at dusk.

When I look into her eyes, it's like I can see her heart. That's because the eyes are the window to the soul.