The word "incompact" refers to something that is not compact, or not tightly packed together. Therefore, the antonyms for incompact would be: compact, dense, impenetrable, solid, condensed, and compressed. These words would describe an object or substance that is closely packed, firmly held together, or reduced in volume. For example, a compact car takes up less space than an incompact car, and a condensed milk has less water content than an incompact one. Using antonyms for incompact can help describe the specific qualities of an object or material, allowing for more accurate communication of information.