The word "lassitude" has been used in literature to evoke a palpable sense of weariness that can be both physical and mental. In some works, its use is strikingly literal—as in Ayn Rand’s depiction of a sudden, debilitating physical collapse [1] or Chekhov’s portrayal of muscle fatigue and oppressive inertia [2, 3]. Other authors extend its meaning to capture an overall state of ennui or moral debility: Dickens employs it to articulate both the physical and emotional debility of his characters [4, 5], while Santayana links it with the indifference toward impracticable ideals [6]. The term also appears in more philosophical and reflective contexts—for example, Montaigne contrasts the notion of lassitude with its actual impact on human dissolution [7]—and finds quirky treatment in the literary experimentation of Joyce [8]. Even environmental descriptions, as seen in H. G. Wells, imbue a whole atmosphere with a sense of overwhelming tiredness [9]. This varied usage, which ranges from the very tangible to the existential, underscores how "lassitude" has long served as a versatile tool for writers to convey the burdens of both body and soul.