Elinor Dashwood represents "sense." She is the anchor of her family, possessing a "strength of understanding" and "coolness of judgment." Her restraint is most evident when she learns of Edward Ferrars’s secret engagement to Lucy Steele. Despite her private heartbreak, she maintains social decorum to protect her family and Edward’s reputation. To Elinor, emotions are internal matters; their outward expression must be regulated to preserve social harmony.
In contrast, Marianne Dashwood is the avatar of "sensibility." She is vibrant, musical, and utterly transparent with her feelings. Marianne views Elinor’s composure as coldness, believing that "to prune one’s expressions of feeling" is a form of dishonesty. Her whirlwind romance with the dashing John Willoughby is defined by an abandonment of propriety—she writes him private letters and visits his estate unchaperoned—placing her personal desires above the expectations of 18th-century society. The Consequences of Extremes Sense and Sensibility
Elinor, however, suffers differently. Her commitment to "sense" forces her into a lonely stoicism. By masking her pain, she carries the emotional burden of the entire family, nearly losing her own chance at happiness because she refuses to demand it. Austen shows that while Elinor’s path is safer, it is also one of immense personal sacrifice. The Path to Synthesis Elinor Dashwood represents "sense
Elinor, too, finds balance. Upon learning that Edward is free from Lucy Steele, her emotional breakthrough—bursting into tears of joy—demonstrates that "sense" is not the absence of feeling, but the management of it. By the journey's end, Elinor has allowed herself to feel, and Marianne has learned to think. Conclusion In contrast, Marianne Dashwood is the avatar of "sensibility
The Conflict of Head and Heart: A Study of Jane Austen’s Sense and Sensibility