"Be in cards" is an idiomatic expression which means that something is likely to happen or is possible. Antonyms for this phrase could be "impossible," "unlikely," or "not in the cards." These words suggest that the desired outcome is not possible or that there is little to no chance of it happening. Other antonyms for "be in cards" may include "improbable," "unsure," or "doubtful." These words convey uncertainty and doubt about the likelihood of the event occurring. Therefore, when someone says that something is not "in the cards," it is usually because they believe it is highly unlikely or not possible.