Simple past tense and past participle of mismate.(verb)
Provided with an unsuitable mate(adjective)
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Use "mismated" in a sentence
"Its feeble beam glanced off the obsidian waters beneath their feet and caught the glitter of slime, the flash of mismated eyes."
"Worsel, the schizophrene, was worse than ever-the dual personality of himself was alone, mismated, in hyperspace, conjured up by a young Lensman with psychic powers, accompanied by the weirdest of fantasies."
"Harlean Carpentier, later to become the most popular female film star of her time, was born in 1911 of a conspicuously mismated and middle-class couple."