The word "take-no-prisoners" implies an aggressive, no-nonsense approach to a situation. Antonyms for this phrase would be words like delicate, gentle, or diplomatic. A person who takes a delicate approach to a situation is careful and cautious, while someone who is gentle is kind and compassionate. Diplomacy involves clear communication and negotiation, as opposed to forceful action. Other antonyms for "take-no-prisoners" might include compromising, yielding, and flexible. These words all suggest a willingness to consider multiple viewpoints and work toward a peaceful resolution, rather than trying to dominate or control a situation.