Densified is a word that implies compression, solidity, and intensity. In contrast, its antonyms convey the opposite meanings of thinness, looseness, and lightness. Some antonyms for densified include airy, flimsy, lightweight, rarefied, sparse, and uncondensed. These words describe materials or substances that are not compacted or condensed, but rather have space or air between their particles. For example, a pillow could be described as being airy, lightweight, or uncondensed, while a brick would be the opposite - densified, solid, and heavy. Antonyms for densified are useful for describing textures, consistency, and weight, and can add depth and nuance to your writing.