The antonym for "more bumper" would be "less bumper." Essentially, the term "more bumper" refers to something that is abundant, plentiful, or excessive in quantity or size. Therefore, the opposite of this would be something that is scarce, limited, or small in quantity or size. For example, if there is more bumper to bumper traffic on the highway, the opposite would be less traffic or a clear road. Similarly, if a product has a more bumper size, the opposite would be a smaller size or lesser quantity. In conclusion, understanding antonyms can help us express ourselves accurately and effectively in our communication.