Most multiplying can be antonymized with "least multiplying." This would indicate that something is not growing or multiplying at a significant pace, and may even be stagnant or decreasing. Other antonyms may include "fixed," "unchanging," or "static." Additionally, words like "dividing," "reducing," or "diminishing" may also serve as antonyms to multiplying. Overall, the opposite of most multiplying would imply a lack of growth or decrease, and the specific antonym used would depend on the context in which it is being used.