Infra dig is a phrase borrowed from Latin that is used to describe something that is beneath one's dignity or social status. In testing antonyms for this phrase, one could consider words such as illustrious or elevated as they describe something that is high or respected. Alternatively, one could consider common or lowly as antonyms, as they describe things that are, by contrast, basic or inferior. Words like sordid, shameful, or debased could also be antonyms for infra dig as they describe things that are disreputable or disgraceful. Ultimately, the choice of antonym could depend on the context in which the phrase is being used.