The phrase "came on strong" typically means to approach something or someone aggressively or forcefully. Some antonyms for "came on strong" might include phrases such as "took a soft approach," "handled gently," "proceeded with caution," "held back," "approached with subtlety," or "took a restrained approach." These phrases suggest a more calm, measured, or strategic approach to the situation at hand, rather than a direct and forceful one. Depending on the context, using the opposite of "came on strong" might be more effective in achieving one's goals, allowing for a more nuanced, thoughtful, or deliberate approach to interactions with others.