Antonyms for the phrase "becoming available" include "scarce," "unavailable," "impossible to obtain," "restricted," and "inaccessible." These terms denote a state of limited or non-existent availability, typically due to high demand, limited supply, or specific restrictions. While "becoming available" suggests the potential for increased access, the antonyms imply the opposite, making it clear that certain resources or opportunities may be out of reach or difficult to obtain. By understanding the various antonyms for "becoming available," one can better grasp the limitations and challenges associated with accessing certain commodities or opportunities in various contexts.