undervalued
adjective C2- Assigned an inappropriately low value.
From the library
To Jane, he could be only a man whose proposals she had refused, and whose merits she had undervalued; but to her own more extensive information, he was the person to whom the whole family were indebted for the first of benefits, and whom she regarded herself with an interest, if not quite so tender, at least as reasonable and just, as what Jane felt for Bingley.
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