Panegyrics are words of praise or tribute to someone or something. Therefore, the antonyms of "panegyrics" would be words that convey disapproving or negative sentiments. Words like criticism, denunciation, condemnation, disapproval, reproach, and blame would all be considered antonyms for "panegyrics." These words imply a tone of hostility or disapproval, which is the opposite of the adulatory tone used in panegyrics. Rather than uplifting and praising, these words indicate that the subject matter is flawed or has made mistakes. While panegyrics are often used to celebrate achievements, antonyms like criticism are used to point out shortcomings, faults, and weaknesses.