Writers have long used "impassable" to vividly convey both concrete and metaphorical obstacles. In historical and travel narratives, authors like Xenophon [1, 2, 3, 4, 5] and Jules Verne [6, 7, 8] employ the word to depict physically obstructed landscapes—be they muddy roads, flooded rivers, or mountain chains—that halt progress. Meanwhile, literary figures such as Bernard Shaw [9] and Thackeray [10, 11, 12] extend its meaning to describe insurmountable emotional or social divides, suggesting barriers within relationships or societal classes. Additionally, works ranging from Mackay’s accounts of congested city streets [13] to Sherman's military memoirs [14, 15, 16, 17] demonstrate the term’s ability to capture a diversity of challenges, making "impassable" a powerful descriptor of both tangible and intangible hindrances in literature.