Definition:

Taedium Vitae:

Ennui. Irksomeness of life. The inanity of sublunary things has afforded a theme to philosophers, moralists and divines, from the earliest records of antiquity: “vanity of vanities,” says the preacher, “all is vanity!” Nor is there anyone, I suppose, who has passed the meridian of life, who has not at some moments felt the nihility of all things.

— Erasmus Darwin, Zoonomia (1794–1796)