The phrase "availing of" can be replaced by its antonyms, which include "refusing," "declining," and "rejecting." These antonyms convey a completely opposite meaning to the word "availing of," which implies making use of an opportunity or taking advantage of something. Refusing to avail of an opportunity, on the other hand, may indicate a lack of interest, capability, or resources. Moreover, declining or rejecting a particular offer or service can suggest a conscious and deliberate decision based on personal values or preferences. Hence, the antonyms of "availing of" provide a range of alternative meanings and perspectives, depending on the context in which they are used.