n. 1
A state of mind producing serious, long-term lowering of enjoyment of life or inability to visualize a happy future; any of several mental disorders with this state of mind as a central feature.
I used to suffer from depression, but now I'm mostly content with my life.
n. 2
A period of low morale or unhappiness (a period of experiencing the above-mentioned state of mind) which lasts longer than several weeks and may include ideation of self-inflicted injury or suicide.
n. 3
An area that is lower in topography than its surroundings.
n. 4
An area of lowered air pressure that generally brings moist weather, sometimes promoting hurricanes and tornadoes.

Related words

Word family: depress depressant depressed depressing depressive
Phrases: clinical depression postpartum depression infranasal depression manic depression seasonal depression summer depression winter depression postnatal depression

Forms

Use in printed books, per decade from 1850 to 2019.

3 letters: low¹, pit¹, dip¹, woe¹
4 letters: dent¹
5 letters: blues¹, grief¹, slump¹, gloom¹
6 letters: hollow², misery³, sorrow², cavity³, dimple²
7 letters: decline², sadness², imprint², lowness
8 letters: distress², lowering³
9 letters: reduction³, hollowing³, dejection, concavity⁴, dysthymia
10 letters: impression³, excavation⁴, melancholy⁴, debasement³, hollowness
11 letters: unhappiness⁴, indentation⁴, melancholia, despondency⁴, prostration³
12 letters: depreciation⁵, hopelessness³, wretchedness
14 letters: discouragement⁴

The small number after each word is its number of syllables (hollow² = 2 syllables).