The term aeronautical refers to anything related to the science or technology of flight. Antonyms for this word could include non-aeronautical, land-based, or ground-based. Non-aeronautical activities might include transportation by automobile, bicycle, or foot, while land-based activities could include farming, construction, or gardening. Ground-based activities might involve activities such as camping, hiking, or skiing. While aeronautical activities focus on the exploration of the skies, non-aeronautical, land-based, and ground-based activities tend to focus on the exploration and exploitation of the Earth's surface. In summary, antonyms for more aeronautical could vary depending on the context and could include non-aeronautical, land-based, or ground-based.