The term 'most uncomplimentary' has a number of potential antonyms, depending on the specific context of the word. In general, antonyms for negative or critical terms like 'uncomplimentary' might include positive or complimentary descriptors, such as 'praiseworthy', 'laudatory', or 'admiring'. Other potential antonyms might include neutral descriptors that do not carry any positive or negative connotations, such as 'objective', 'evenhanded', or 'impartial'. In some cases, antonyms for 'most uncomplimentary' might also include more specific descriptors that negate the negative connotations of the phrase, such as 'gently critical', 'constructive', or 'thoughtful'.