Misalliance n. A marriage with a person of inferior rank or social station; an improper alliance; a mesalliance. "A Leigh had made a misalliance, and blushed A Howard should know it."
... is a madman. By incurring the enmity of his Imperial Master he would rush on to his own destruction. Suppose by this misalliance, the very map of Europe itself ... — A Man and His Money • Frederic Stewart Isham