The term "more coltish" describes a playful, youthful energy. Its antonyms include words that describe traits opposite to this, such as serious, mature, or composed. Someone who is less coltish might be more focused, practical, or reserved in their demeanor. They might be less apt to take risks or seek out new experiences, preferring instead to stick to familiar routines. While being coltish can be endearing, it can also be seen as immature or impractical in certain circumstances. Cultivating a balanced approach that incorporates elements of both playfulness and responsibility is key to success in all areas of life.