Meanings of heavy depression in English

But somehow, I know not why, a heavy depression fell upon me.

Balzac had hours of heavy depression; he went for a rest to Mme.

The events of the afternoon had left her with a feeling of heavy depression.

But cast down, she was, in heavy depression.

At other times there was a heavy depression on the bed as if someone were sitting there!

A full appreciation of my mad folly came to me, and with it a sense of heavy depression.

A panic would mean not only a withdrawal of deposits and a calling of loans, but a heavy depression of securities.

It was only a flash, however, and changed quickly into something like the helplessness that used to characterize her glance in moments of heavy depression.