The term "anti-thetically" is used to describe words or concepts that are opposite in meaning. Therefore, the antonyms of this term would be words that share similar meanings. Some possible antonyms for "anti-thetically" might include synonyms such as congruently, correspondingly, identically, or similarly. These terms suggest a close relationship or similarities between two concepts, rather than an opposition as implied by "anti-thetically". Alternatively, antonyms for "anti-thetically" might include terms such as harmoniously, cohesively, and compatibly, which describe a sense of unity or agreement instead of opposition.