noun
a person who is superficial, artificial, or fake in their behavior or appearance
adjective
describing the type of person as being artificial or fake
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The artist sculpted a plastic person out of polymer clay.
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She's such a plastic person, always changing her personality to fit in with others.
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I can't stand hanging out with that plastic person, they're so fake.
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His smile was as artificial as a plastic person's, lacking any genuine emotion.