Unveiled means to reveal or make known. So, antonyms for the phrase "most unveiled" would mean keeping a secret or hidden. Some antonyms for this phrase could include cryptic, enigmatic, obscure, subtle, or veiled. These words suggest a sense of mystery or ambiguity, representing the opposite of being revealed or made known. The antonyms imply that something is not easy to understand or decipher. The use of these antonyms can convey a tone of secrecy or mystery, creating a sense of curiosity or intrigue.