The term “unspeakable” has long served as a literary device to evoke sensations and states that transcend ordinary description. In some texts, it conjures images of horrifying, ineffable terror—as seen in H. G. Wells’s portrayal of indescribable monstrosities [1] and the grim degradation of humanity [2]—while in others it celebrates transcendent positive experiences, such as the ecstatic joy of battle [3] or the ineffable bliss in moments of farewell [4, 5]. Authors like Thomas Carlyle [6, 7] and Edgar Allan Poe [8, 9] harness the word to articulate extreme emotions that defy easy encapsulation, whether those are passions of rapture or depths of despair. Overall, “unspeakable” is deployed with a remarkable flexibility, highlighting both sublime wonder and abject horror, and lending a sense of boundlessness to experiences that cannot be confined by mere words.