"Making acute" implies increasing the intensity of something, whether it's a sensation, an emotion, or a problem. The antonyms for this phrase could vary depending on the context, but some possible choices include "diminishing dullness," "reducing bluntness," "soothing calmness," or "relieving tension." These alternatives suggest easing, softening, or mitigating a situation rather than escalating it. For instance, instead of making acute pain worse, we might aim to alleviate it. At the same time, it's worth noting that some situations may require acute attention to resolve, and in these cases, the antonyms of "making acute" may not be desirable or applicable.