The term "more compressed" implies that something has been squeezed or flattened to a greater degree than before. The opposite of this can be described as "less compressed," where the object or substance has more space and is not as tightly packed together. Another antonym for "more compressed" can be "expanded," conveying an idea of growth or expansion, rather than contraction or compression. There's also "looser," as in less tightly packed, and "fluffier," which suggests a lighter, airier composition. Overall, the opposite of "more compressed" encompasses ideas of spaciousness, lightness, and expansion.