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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Also, Ahasuerus is the ultimate failson — impetuous, ineffectual, at one point draping himself in a curtain and sobbing.
Source: https://forward.com/culture/538331/purim-movies-book-of-queen-esther-christian/
In other words, so as not to give him the time to organize a rebellion against Ahasuerus when he discovered that the king was angry with him.