Antonyms for the phrase "more free wheeling" would be "less spontaneous," "more rigid," "restricted," or "constrained." These antonyms imply a lack of flexibility and adaptability, which is the opposite of being "free wheeling." They suggest a person or situation that adheres to rules and regulations without deviation, or a lack of willingness to experiment or take risks. While being "free wheeling" can come with its own set of challenges and drawbacks, being too constrained can stifle creativity and innovation. Striking a balance between the two is important for success and growth, whether in personal or professional settings.