introvert
US /ˈɪn.trə.vɝːt/
UK /ˈɪn.trə.vɝːt/

1.
a shy, reticent person
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As an introvert, she prefers quiet evenings at home to large social gatherings.
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He's an introvert who enjoys deep conversations with a few close friends.
1.
characterized by introversion; tending to be shy or reserved
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She has an introvert personality, preferring solitude.
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His quiet demeanor is typical of an introvert person.