The opposite of "most erupting" can be described in many ways, depending on the context. If we are talking about volcanoes, the antonyms could be calm, dormant, or inactive. In the case of emotions, the antonyms might be peaceful, serene, or tranquil. When referring to social situations, the antonyms could be quiet, subdued, or relaxed. Similarly, in political discourse, antonyms could include diplomatic, conciliatory, or compromise-oriented. In essence, the antonyms for "most erupting" are those that connote a state of quiet, calm, and peacefulness, and they differ depending on the context of usage.