1781, "directed inward" (of the mind, etc.), past-participle adjective from introvert (v.). Psychological sense is from 1915. Other adjectives in the non-psychological sense were introversive (1820), introvertive (1846), introverse (1874).
introspect
introspection
introspective
introversion
introvert
introverted
intrude
intruder
intrusion
intrusive
intrust
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