The term "most catachrestic" is an unusual one, as catachresis is a figure of speech that refers to the use of a word in a way that is incorrect or inappropriate. Antonyms for such a word would, therefore, refer to words or phrases that are correct, appropriate and accurate. Some antonyms for "most catachrestic" include precise, clear, accurate, correct, proper, fitting, suitable, and exact. In other words, these words are the opposite of catachresis, and instead, convey meaning in a way that is both clear and easy to understand. When choosing our words, it's important to be mindful of their meanings, to avoid using inappropriate or incorrect usage.