noun 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.
I was in the doldrums yesterday and just didn’t feel inspired.
noun 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.
noun Usually preceded by the: a part of the ocean near the equator where calms, squalls, and light, baffling winds are common.
noun plural of doldrum (“slothful or stupid person”)