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

There the miracle occurred: Minne and Antoine found they were not so mismated after all.

From Time Magazine Archive

They have not much to sell: a handful of amber beads, half a dozen mismated, tinted water tumblers, a tall, slender, gaily painted chalk doll.

From Time Magazine Archive

Sometimes she gets kidded by Announcer Dick Willard and Husband Bill Sauter, a quiet, wisecracking ex-actor who contributes a felicitous conjugal note that draws plaintive queries from mismated listeners.

From Time Magazine Archive

There’s a smoking jacket, two pairs of golf-trousers, several pairs of mismated gloves, a wonderful lot of undarned stockings, bonnets and underclothes to burn, two jackets and a bathin’ suit.

From Hepsey Burke by Frank N. (Frank Noyes) Westcott

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

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

M. Arouet pater did not marry until his mind was mature, so that he might avoid the danger of a mismating.

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

It is desirable, however, to realize that mismating is the real evil.

From Applied Eugenics by Paul Popenoe