The word "complimentally" means to offer praise or admiration. However, there are many antonyms to this word which imply disapproval, criticism, or insult. Some common antonyms for "complimentally" are negatively, critically, insultingly, disparagingly, unflatteringly, harshly, sarcastically, cynically and scornfully. Using these words in place of "complimentally" can change the entire meaning of a sentence. For example, "She spoke about her ex-husband complimentally" becomes "She spoke about her ex-husband insultingly" when we replace the antonym. Thus, it's important to use the correct antonym of complimentally while communicating, to convey thoughts and opinions precisely.