The phrase "most unprompted" describes an action or behavior that is spontaneous, without hesitation or external influence. Antonyms for this term may include words like "deliberate," "calculated," or "premeditated," which suggest actions that are carefully planned and intentional. Other antonyms may include "guarded," "reserved," or "inhibited," which indicate a sense of caution or restraint in one's actions. Still other antonyms for "most unprompted" may include words like "unmindful," "indifferent," or "insensitive," which suggest a lack of awareness, consideration, or empathy in behavior. Ultimately, the antonyms for "most unprompted" will vary depending on context and intent.