The antonyms for the word "un-mask" include "cover," "disguise," "hide," "cloak," "mask," and "conceal." These words indicate the opposite action of revealing or making something known, as opposed to keeping it hidden or obscured. In many situations, the act of covering or disguising can be seen as a necessary protective measure, such as when concealing one's identity for safety or security reasons. However, in other cases, it may signify an attempt to deceive or mislead others by presenting a false facade or concealing the truth. Ultimately, the choice to un-mask or conceal something depends on the context and the intentions of the individuals involved.