Introverted

1. Turned or thrust inward, particularly:
   1. Thinking about internal or spiritual matters.
   2. (psychology) Of or characteristic of the personality of an introvert: thoughtful, reflective.
   3. (poetry, literature) Arranged so that two similar words, lines, etc. form the middle of the structure.

Antonyms

• (antonym(s) of “psychology”): extraverted (proper); extroverted (informal)