mismarriage

noun
mis·​mar·​riage | \ ˌmis-ˈmer-ij How to pronounce mismarriage (audio) , -ˈma-rij\
plural mismarriages

Definition of mismarriage

: an unsuitable marriage or union In biographies, [Lord] Byron's mismarriage and love relations with women have monopolized attention.— Jacques Barzun This mismarriage of death and taxes will be one of the first orders of business that the Senate … is expected to take up before the end of the year.The San Jose Mercury News

First Known Use of mismarriage

1817, in the meaning defined above

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