The antonyms for the phrase "more passionately" may vary depending on the perspective or context of the situation. Generally, the opposite of being passionate is being dispassionate or indifferent. This means having a lack of intense emotions or feelings towards something. Other antonyms may include nonchalant, apathetic, uninterested, and detached. These words suggest a lack of enthusiasm, zeal, or fervor towards a particular activity, idea, or person. Therefore, if one is less passionate, they may exhibit traits of ambivalence, indifference, or coldness. Antonyms for "more passionately" are useful when one wants to express a different attitude or level of emotion towards something.