The phrase "if at all" is usually used to express an element of doubt or uncertainty about the likelihood of something happening. There are many synonyms that can be used in its place, depending on the context and intended meaning of the sentence. Common alternatives include "if possible," "if feasible," "if necessarily," "if need be," and "if there is any chance." Other options might include "in the off chance," "in the event that," "assuming," or "granting that." By using alternative phrasing, writers can add nuance to their language and convey a clearer sense of what they mean.