The term "did an injustice to" carries the connotation of a wrong or harm done to someone or something. Antonyms for this phrase might include "did justice to," which indicates that something was given a fair or positive treatment. Other antonyms could include "righted," "repaired," "amended," "restored," or "redressed," all of which imply that a wrong has been corrected or made right. "Honored," "respected," and "celebrated" are also antonyms, indicating positive treatment and recognition of someone or something. Overall, antonyms for "did an injustice to" suggest actions that are fair, positive, and respectful.