The antonyms for "un-masking" would involve hiding, concealing or covering. These words could include "masking," "disguising," "veiling," "camouflaging" or "obscuring." In contrast to un-masking, these words imply concealment, disguise or deception. They suggest a desire or need to conceal one's true identity, motives, or intentions. These words are often used in the context of espionage, undercover work or criminal activity. While un-masking suggests a revealing or unveiling of truth, its antonyms imply secrecy, misdirection or illusion. By understanding these antonyms, we can deepen our awareness of the different ways language reflects our attitudes towards truth and deception.