adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'undistinguished' describes a noun or pronoun as not standing out or being exceptional.
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The undistinguished candidate failed to make an impression during the debate.
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The undistinguished singer didn't stand out in the talent show.
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That undistinguished movie was a total snooze fest.
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His undistinguished career never reached the heights he had hoped for.