The phrase "most gladiatorial" suggests an intense or fierce battle-like atmosphere. Antonyms for this term could include peaceable, pacific, calm, or serene. These words all imply a sense of tranquility, peacefulness, and lack of violence. Other antonyms might include diplomatic, tactful, or conciliatory, which suggest a less confrontational or aggressive approach to conflict resolution. The word "gladiatorial" is often used metaphorically to describe heated debates or intense competitions, so an antonym could be mild or moderate. Other antonyms might include cooperative, collaborative, or harmonious, which suggest a more collaborative or cooperative approach to problem-solving or decision-making.