The phrase "is apprised of" means to be informed or made aware of something. Therefore, the antonyms for this phrase would be words or phrases that indicate a lack of knowledge or understanding. These could include "uninformed," "unaware," "ignorant," "clueless," "blind to," and "in the dark." Other antonyms could be "oblivious," "naive," "confused," or "misinformed." It's important to note that these words may carry slightly different meanings, but generally convey the opposite of being apprised of something. It's crucial to be aware of these antonyms and use them appropriately in context to ensure clarity of communication.