The term summated means to add up or total. The opposite of summated would be to subtract or diminish. Other antonyms for summated could include separate, divide, fragment, or disintegrate. These words all imply a breaking apart or dividing of something, rather than a combining or totaling. Additionally, antonyms for summated could include words that refer to the opposite of a whole, such as incomplete or unfinished. These terms suggest that something is missing or lacking, rather than being complete or added up. Overall, the antonyms for summated all suggest a sense of separation or incompleteness, rather than a sense of completion or totality.