To find antonyms for the phrase "more smoldering," it is necessary to understand the meaning of the word. Smoldering refers to a slow-burning fire, one that is not actively burning but still emitting smoke and heat. An antonym for this phrase would be something that is quickly extinguished, or perhaps something that is not burning at all. Words that could be used as antonyms for smoldering include cool, extinguished, cold, quenched, and out. These words represent the opposite of a slow-burning fire, and suggest a complete lack of heat or fire altogether.