Why is Vanity Fair considered William Makepeace Thackeray’s greatest achievement?

Vanity Fair is considered William Makepeace Thackeray’s greatest achievement due to its rich movement, vivid color, and masterful portrayal of early 19th-century society. As a densely populated, multilayered panorama of manners and human frailties, the novel is celebrated for its narrative skill, subtle characterization, and descriptive power.12

The work is distinguished by its "antiheroic" nature, subtitled "A Novel Without a Hero," which allows Thackeray to offer a dispassionate, insightful analysis of human ambition and the ambivalence of human motives. By contrasting the fortunes of the passive Amelia Sedley and the ambitious, amoral Becky Sharp—perhaps his most memorable character—Thackeray provides a lasting evaluation of the human condition. Ultimately, the novel’s tragic irony and its exploration of the vanity inherent in life elevate it to one of the outstanding works of its period and a classic of the English language.123