He takes medicine every day because he suffers from depression.

He is suffering from depression.

This forest has a dense atmosphere.

His irresistible energy could be felt by everyone.

I'm fed up with his gloomy attitude.

He was carrying a feeling of gloom.

He fell into dejection.

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

He fell backwards as if doing a somersault in surprise.

He did a somersault in the park.