The antonyms for "stirring embers" are many and varied. The opposite of stirring is stillness or motionlessness, so some antonyms might include tranquil, calm, or sedate. Alternatively, if we take the word embers to mean something that is dying out, then antonyms could include lively, energetic, or active. Other antonyms that might fit the bill for "stirring embers" could include cold, lifeless, stagnant, dull or unexciting. Ultimately, the antonyms that are most appropriate for this phrase will depend on the context in which it is used and the writer's intended meaning.