The Unbearable Lightness of Being (Czech: Nesnesitelná lehkost bytí) is a 1984 novel by Milan Kundera, about two men, two women, a dog and their lives in the Prague Spring period of Czechoslovak history in 1968. Although written in 1982, the novel was not published until two years later, in a French translation (as L'Insoutenable légèreté de l'être). The original Czech text was published the following year.
The Unbearable Lightness of Being takes place mainly in Prague in the late 1960s and 1970s. It explores the artistic and intellectual life of Czech society during the Communist period, from the Prague Spring to the Soviet Union’s August 1968 invasion and its aftermath. The main characters are Tomáš, a surgeon; his wife Tereza, a photographer anguished by her husband's infidelities; Tomáš’s lover Sabina, a free-spirited artist; Franz, a Swiss university professor and lover of Sabina; and Šimon, Tomáš’ estranged son from an earlier marriage.