The antonyms for the word "more dulled" are "sharper", "brighter", and "brisker". When something is dulled, it loses its sharpness or brightness. To make it sharp again, something has to be done to it. For example, to make a blunt knife sharper, it has to be sharpened with a sharpening stone. Similarly, to make a dull color brighter, it has to be mixed with a brighter color or have a brightening agent applied. Lastly, when something is dulled, it also loses some of its energy, so to make it brisker, something has to be done to increase its energy.