The Oxford Thesaurus An A-Z Dictionary of Synonyms - depressionn.

1) indentation, dent, dimple, impression, pit, hollow, recess, cavity, concavity, dip: When the box fell, its corner left a small depression in the top of the metal cabinet. 2) dejection, despair, gloom, downheartedness, sadness, melancholy, discouragement, despondency, gloominess, glumness, the blues, unhappiness; Colloq the dumps: A general feeling of depression came over us at the doctor's words. 3) recession, slump, (economic) decline, downturn, US and Canadian bust: The analysts are unable to predict accurately either booms or depressions.