The term "unsuitable" in literature is employed to signal a lack of proper fit or harmony between elements, whether in ideas, relationships, or settings. In one work, it defines a discord in music, where a melody becomes wrong when paired with unsuitable harmony [1], while in another, it describes how certain goods are deemed unfit for divine offerings [2]. The word spans contexts, from social commentary—illustrating a character’s unfitness as a partner or friend [3, 4, 5, 6]—to pragmatic assessments of location or climate, as when a ground is found unsuitable for offices or specific agricultural pursuits [7, 8, 9]. It also critiques personal choices, as seen in commentary on friendships and marriages deemed unsuitable [10, 11, 12, 13]. Even in technical and aesthetic debates, unsuitable marks a standard too harsh to meet [14, 15]. This diversity of usage underscores the term’s adaptability in conveying a sense of misalignment or inappropriateness across a broad spectrum of literary themes.