Antonyms for "becoming apparent" would include words and expressions such as "unclear," "obscure," "hidden," "unseen," "ambiguous," "vague," "concealed," "disguised," "invisible," and "latent." These words convey the idea that something is not immediately obvious or evident, and may require further investigation, exploration, or analysis to uncover its true nature. On the other hand, "becoming apparent" suggests that something is gradually becoming clearer, more evident, or more obvious over time, as more information becomes available or as one gains more insight into a situation. By using antonyms for "becoming apparent" in communication, one can convey a sense of uncertainty, doubt, or mystery about a particular matter.