Antonyms, also known as opposites, are words that have opposite meanings to each other. For the word "pre-supposes", some of the antonyms could include deny, disprove, negate, contradict, and refute. These words suggest a lack of acceptance or belief in a particular assumption or preconceived notion. Whereas "pre-supposes" implies that something is taken for granted or assumed to be true, the antonyms suggest a rejection or challenge of such assumptions. By understanding the antonyms of a word, one can gain a deeper understanding of its meaning and context, and use it more effectively in communication.