The word "abecedaries" has no true antonyms, as it is a noun that refers to a book or set of primers that teaches the alphabet. However, there are some related words that could be considered opposites, depending on context. For example, if "abecedaries" were being used to describe someone who is very knowledgeable or well-read, an antonym might be "ignorant" or "uneducated." Alternatively, if the word was being used to describe a book that is difficult to understand or unhelpful, an antonym could be "accessible" or "user-friendly." In general, though, "abecedaries" is a unique word with limited and specific meanings, making it difficult to find true opposites.