Tuesday with morrie the word inexplcably in book?

In "Tuesdays with Morrie," the word "inexplicably" is used to describe the sudden decline in Morrie's health. Throughout the book, Morrie's health fluctuates, but there comes a point where his condition takes an unexpected turn for the worse. The use of the word "inexplicably" emphasizes the unpredictable and baffling nature of his decline, leaving both Morrie and Mitch puzzled and deeply affected by the rapid change.