"Ill-conditioned" refers to something that is poorly prepared or in a bad state. Its antonyms are words that describe the opposite, such as well-conditioned, healthy, strong, sturdy, robust, and fit. Well-conditioned refers to something that is in good shape, while healthy relates to the state of being physically or mentally sound. Strong denotes a great physical or mental power, while sturdy means something that is well-built and able to withstand stress or pressure. Robust refers to something that is healthy and strong, and fit means something that is in good shape physically. Using these antonyms can help describe something that is in good shape and well-prepared.