doldrums

Short definition from Wiktionary

Noun

1. 1
   Usually preceded by the: a state of apathy or lack of interest; a situation where one feels boredom, ennui, or tedium; a state of listlessness or malaise.
2. 2
   Usually preceded by the: the state of a sailing ship when it is impeded by calms or light, baffling winds, and is unable to make progress.
3. 3
   Usually preceded by the: a part of the ocean near the equator where calms, squalls, and light, baffling winds are common.
4. 4
   plural of doldrum (“slothful or stupid person”)