The phrase "in cards" is not a word itself, but rather a colloquialism meaning "likely to happen." The antonym for this phrase would be "unlikely." Other antonyms for the concept of something being "in the cards" could include "impossible," "unexpected," or "unforeseeable." Essentially, any term indicating a lack of certainty or probability could be considered an antonym for this phrase. It's important to note, however, that this phrase is an idiom and should be interpreted figuratively rather than literally.