The phrase "goosed up" typically means to make something more exciting, interesting or appealing. Some antonyms for "goosed up" could include dull, uninteresting or plain. These words suggest a lack of excitement or energy, and imply that something has not been enhanced or improved in any way. Other antonyms could include unadorned, understated or unembellished, which imply a simple, minimalist approach. However, it's important to note that antonyms depend on the context and the specific usage of the word, so the opposite of "goosed up" may vary depending on the situation.