The antonyms for the word "says passing" can vary depending on the context in which it is used. If we consider the word "says" as a verb that means to express something in words, then the antonyms could be silence, muteness, or quietness. Alternatively, if we consider "passing" as an adjective that means brief or transitory, the antonyms could be permanent, enduring, or lasting. In literature, antonyms are often used to create contrast and emphasize the differences between characters or events. Therefore, selecting the right antonyms for "says passing" can help writers convey a particular tone or mood in their work.