Adjectives

(s)recluse, reclusive, withdrawnwithdrawn from society; seeking solitude“lived an unsocial reclusive life”
(s)cloistered, reclusive, secluded, sequesteredproviding privacy or seclusion“the cloistered academic world of books”, “sat close together in the sequestered pergola”, “sitting under the reclusive calm of a shade tree”, “a secluded romantic spot”