Undset play biographical name Und·set \ˈu̇n-ˌset\ Definition of Undset Si*grid play \ˈsi-grē, -grəd\ 1882–1949 Norw. nov. See words that rhyme with Undset Writing? Check your grammar now! Seen and Heard What made you want to look up Undset? Please tell us where you read or heard it (including the quote, if possible).