<span>Guenevere is darning her husbands socks when her friend Vivien stops by for a visit. Vivien tells her that she is carrying on a secret affair with the married Lancelot who plans to leave his wife and marry her. After Vivien leaves, Mary, a servant girl, confesses to Guinevere that she threw herself at Lancelot. Moments later, Lancelot appears and he shares a steamy kiss with Guinevere but they ultimately decide to forget their attraction to one another and the married woman resumes darning her husband's socks.</span>
I think it's VANITY
Explanation:
I just looked up each definition
The definition of the capitalized word in the statement is "lessen". In this context, the sentence is saying that the rivers cannot lessen the love of that person.
Hope this helps!
Signed, Liz