misalliance
mi·sal·liance
noun
1.
an unsuitable alliance (especially with regard to marriage)
Origin
From mis- + alliance, partly after French mésalliance.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.