The term "nonchalance" has been employed in literature to convey an air of effortless detachment or calm indifference, often masking deeper emotional currents. For instance, Dostoyevsky illustrates a character’s seemingly indifferent posture, as seen while Verhovensky lounges without greeting others ([1]) and silently cuts his nails with unruffled ease ([2]). Similarly, Molière’s character adopts a mannered casualness in both speech and action ([3]), while Edgar Allan Poe uses the demeanor in varied contexts—from a cat’s demure inspection of its surroundings ([4], [5]) to a character whose cool exterior belies underlying agitation ([6]), and even in a more overtly mock-serious remark ([7]). Further reinforcing the notion, Emerson ([8]) and French instructional texts ([9]) define the word as an embodiment of indifference and carelessness, a sentiment also echoed in the works of Stephen Crane ([10]), F. Scott Fitzgerald ([11]), and Paramahansa Yogananda ([12]).