The phrase "most stiff necked" implies stubbornness and an unwillingness to change or adapt. Antonyms for this phrase would include words like flexible, adaptable, open-minded, and receptive. These words suggest a willingness to consider different viewpoints, to learn from others, and to adapt to new situations. Someone who is flexible and open-minded is more likely to succeed in a rapidly changing world, while someone who is stiff necked may struggle to keep up. By embracing adaptability and openness, individuals can grow and learn from new experiences, making them more resilient and better able to achieve their goals.