Shy and preferring quiet activities and time alone rather than socializing in large groups.
From 'intro-' (inward) plus 'vert' (turn), coined by psychologist Carl Jung in 1921 to describe people whose energy is directed inward rather than outward.
Jung created 'introvert' and 'extrovert' less than 100 years ago—before that, people just thought some folks were 'unsociable' without realizing it was how their brains were wired.
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