"Sextillionfold" means to multiply something by a billion to the sixth power, which makes it a term used in exponential numbers. Some synonyms for "sextillionfold" include "astonishingly," "tremendously," "enormously," "incredibly," "exponentially," and "vastly." Other synonyms that convey multiples of vast quantities include "innumerable," "immeasurable," "countless," and "limitless." Another phrase that can be used instead of "sextillionfold" is "an astronomical number." This phrase implies a vast and unquantifiable amount. Other expressions that can be used include "an infinite amount," "an incalculable number," and "a countless multitude." The synonyms can be used to prevent repetition in the text and make it more varied.