A word so dreadful and rotten

Antonia White’s coming-of-age novel Frost in May, published in 1933, became Virago Press’s first Modern Classic in 1978, which is the edition I recently read. It tells the story of Fernanda (‘Nanda’) as she progresses through the Convent of the Five Wounds, coming to terms with its norms and her evolving relationship with religion.

Frost in May is apparently based on White’s own experiences in Catholic boarding school. Tessa Hadley describes it in the Guardian as ‘exquisitely poised between a condemnation of the school and a love letter to it’. The convent applies a severe form of discipline, which now and then encompasses language use:

Nanda dropped her lily with awe. It stood, she knew, for some mysterious possession . . . her Purity. What Purity was she was still uncertain, being too shy to ask, but she realised it was something very important. St. Aloysius Gonzaga had fainted when he heard an impure word. What could the word have been? Perhaps it was “___,” a word so dreadful that she only whispered it in her very worst, most defiant moments. She blushed and passionately begged Our Lady’s pardon for even having thought of such a word in her presence.

In the book, the unspeakable word appears within the quotation marks. I’ve removed it to see if you can guess what it is. The answer appears further down. I’ll give you a clue: it begins with ‘b’, and it’s not a slur or swear word.