The antonyms for the word "hundred-and-sixtieth" include "first," "second," "third," and so on, up to "one hundred and fifty-ninth." Another antonym for "hundred-and-sixtieth" is "bottom," as it denotes the lowest point or end of something. Additionally, other antonyms can be derived based on the context of the word, such as "latest," "newest," or "most recent" if referring to a date, event, or trend. Thus, understanding the antonyms for any word can help to expand one's vocabulary, improve communication, and enhance overall language comprehension.