Uncondense refers to the process of making something less compact or dense. In order to find the antonyms for uncondense, we must consider words that imply making something more compact or dense. The opposite of uncondense is, therefore, "condense," which means to make something smaller or more compact. Some other antonyms for uncondense include compress, constrict, concentrate, and congeal. These words all describe the process of making something more compact or less spread out. While uncondense is a relatively uncommon word, it is important to understand its antonyms in order to build a more complete understanding of language and communication.