Simple past tense and past participle of plight.(verb)
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Use "plighted" in a sentence
"Smitten by her disinterestedness as well as by her beauty, Lord Clavering would gladly marry her, but is bound by his word plighted to Lord Dunbar's daughter."
"Lord Clavering would gladly marry her, but is bound by his word plighted to Lord Dunbar’s daughter."
"Give me my horse and arms, and wait for me here; I will go in quest of this knight, and dead or alive I will make him keep his word plighted to so great beauty. ""