The antonyms for "lets be known" can vary depending on the context. However, some possible antonyms include "hide," "conceal," "mask," "disguise," "camouflage," "suppress," "repress," and "silence." These words imply that someone actively tries to keep themselves or something else unknown or hidden. On the other hand, "lets be known" means making oneself or something else known and visible to others. It asserts a willingness to share information or showcase oneself, rather than hiding in the shadows. Understanding antonyms for words can help expand one's vocabulary and communicate more effectively by using the right words based on the context.