Fortified, lightened, loosened, unloaded, weakened, outspread, dispersed, expanded, softened, unfurled, unfurled, unfurled. Densened implies compacting, consolidating, or compressing. Its antonyms express the opposite of these actions, indicating dispersion, lightening, or weakening. Loose, for example, might be used as an antonym for densened to describe a piece of fabric that had been pulled taut and then was allowed to relax. Softened may also serve as an antonym to densened to indicate something that had been rigid, but became more pliable or supple. By using antonyms, we can better understand the nuances of a word's meaning and how it can be applied in different contexts.