The antonyms for the word "most detonative" could be "least explosive," "safe," or "stable." These antonyms suggest a lack of volatility or likelihood of sudden, powerful release of energy. For example, if someone were to describe a situation as "most detonative," they might mean that it is ripe for conflict or chaos. Conversely, if someone were to describe a situation as "least explosive," they might mean that it is calm or peaceful. Other antonyms for "most detonative" might include "quiet," "mild," or "unassuming," all of which suggest a lack of potential for sudden outbursts or extreme reactions.