The phrase "be par" typically means "equal" or "even." Some common antonyms for "be par" include "unequal," "disproportionate," and "imbalanced." If two things are "unequal," it means that they are not the same in size, amount, or other qualities. "Disproportionate" refers to something that doesn't match up properly, like when one part of a whole is much larger or smaller than it should be. "Imbalanced" means that something is out of proportion or unstable. In contrast to "be par," these antonyms suggest a lack of equivalence or symmetry.