Gilt Edge is a term used to describe something that is of the highest quality or standard. The opposite of this term, therefore, would be something of a lower quality or standard. The antonyms for Gilt Edge can include words such as mediocre, ordinary, average, normal, and standard. These terms, when used in contrast to Gilt Edge, imply a lack of uniqueness or excellence. Additionally, words such as second-rate, substandard, inferior, and low-quality can be used as antonyms for Gilt Edge to describe something of a significantly lower quality. In summary, the antonyms for Gilt Edge indicate a lack of quality or uniqueness, making it an essential vocabulary term to understand.