Writeup refers to an article or report, typically written for a specific purpose or audience. When looking for antonyms for writeup, we can consider words that are opposite in meaning or serve as alternatives. Some possible antonyms could include: silence, omission, exclusion, neglect, disregard, ignorance, or apathy. For example, if an important detail is omitted from a writeup, it could be considered "neglect" or "exclusion". Alternatively, if someone chooses not to write a report or article, they are showing "apathy" or "disregard" for the task at hand. Overall, there are a variety of different antonyms that can be used depending on the specific context and situation.