Unextravagant is a term used to describe things that are modest or plain. It is an adjective that stands in opposition to extravagance, which refers to lavish and luxurious things. If we were to look for the antonyms of unextravagant, we would find many alternatives, including lavish, luxurious, opulent, affluent, and wasteful, among others. These words represent the opposite of unextravagant, describing things that are indulgent, excessive, and often unnecessary. Therefore, if we want to describe something that is not unextravagant, we will need to use one of these terms, depending on the context and tone of our writing.