The antonyms for the phrase "wast made known" could be kept secret, hidden, or concealed. When something is not made known, it remains shrouded in mystery and secrecy. Keeping secrets can be useful in certain situations, such as protecting confidential information, but it can also be harmful when it prevents important truths from being discovered or shared. Conversely, making something known can bring clarity and understanding, even if it may also lead to discomfort or disagreement. Ultimately, the value of sharing information depends on the situation and the intended outcome, whether it is to inform, persuade, or deceive.