mismate

Phyllie, don't mismate; those that do regret it.

From Tobogganing on Parnassus by Franklin P. (Franklin Pierce) Adams

Of the 1975 comedy-drama "Lucky Lady," for example, he wrote that it was a "cynical, vulgar, contrived, mismated, violent, uneven and uninteresting disaster."

From Los Angeles Times ● Nov. 17, 2014

Under the old Army method of pushing people around on paper, too often men and jobs were mismated.

From Time Magazine Archive

Unaware or uninterested that the two are mismated, the matchmakers give their efforts much more sense of ravishment than of matrimony.

From Time Magazine Archive

One listener summed it up: "It didn't take Bernstein to show that they were mismated."

From Time Magazine Archive

At once it gave the startling impression of separate semi-faces filched from two different rawheads and slapped together thus, in smeared, mismated makeshift, that was hideous.

From The Red Debt Echoes from Kentucky by Everett MacDonald

The similar drug diethylstilbestrol, which Yale researchers are finding equally effective, has been used by veterinarians for years to treat mismating in animals.

From Time Magazine Archive

Their marriage had been a mistake, that was all,—a mismating, as many marriages were.

From The Cords of Vanity A Comedy of Shirking by James Branch Cabell

However, they said very little about this mismating to any of their acquaintances, though sometimes Steve would look at James’s wife and sigh, and James would look at Steve’s wife and do the same. 

From Life's Little Ironies by Thomas Hardy

It was a most queer mismating, for the man was plain, sincere and honorable, and she was almost everything else.

From Little Journeys to the Homes of the Great Philosophers, Volume 8 by Elbert Hubbard

In order to explain what perfect marriage is, Swedenborg works by the process of elimination and reveals every possible condition of mismating.

From Little Journeys to the Homes of the Great Philosophers, Volume 8 by Elbert Hubbard