Antonyms are words that have opposite meanings. For the word "atticisms," which refers to using archaic or outdated language or expressions, some antonyms could be modernity, topicality, currency, or contemporaneity. These antonyms convey a sense of being up-to-date, relevant, and current. Some other possible antonyms for the term could be colloquialism, informality or vernacular, which suggest the use of casual, informal language rather than formal or outdated expressions. By using antonyms, we can better understand the meaning and context of a word by comparing and contrasting it with its opposite meaning.