Most vituperatory refers to language that is abusive, defamatory, and highly critical. Antonyms for the word most vituperatory would be words that convey respect, admiration, and praise. These words would include dignified, courteous, amplified, laudatory, and complimentary. They are utilized to appreciate someone's good qualities or performance, rather than finding faults and defects. Using any of these antonyms in a conversation or a piece of writing can help one to avoid sounding negative, harsh or biased towards someone or something. Therefore, the use of positive language in communication can make a significant difference in how messages are received by the audience.