The antonyms for the phrase "be habit of" are varied, and they depend on the context in which it is used. For instance, if we consider the phrase in terms of someone's behavior, the antonyms could be "avoid," "break," or "change." On the other hand, if we consider the phrase in terms of a person's personality or character, the antonyms could be "unfamiliar," "unaccustomed," or "unusual." Additionally, if we consider the phrase in the context of an addiction or compulsive behavior, the antonyms could be "resist," "abstain," or "quit." Therefore, the antonyms for "be habit of" can vary, depending on the situation or perspective.