In offing is a phrase that is used to denote something that is going to happen soon or is in the near future. However, there are a number of antonyms for this phrase that suggest something different entirely. For example, the antonym "far-off" connotes that something is going to happen in the distant future or is unlikely to happen at all. Similarly, "past" suggests that something has already happened, while "impossible" indicates that something cannot happen or is extremely unlikely to occur. Other antonyms for "in offing" might include "uncertain," "doubtful," or "remote," all of which convey a sense of uncertainty or hesitation about the future prospect.