Reclusive means isolated or preferring to be isolated from the world.
Reclusive is an adjective.
Synonyms: lonely, isolated, solitary, private, secluded, sequestered.
Antonyms: sociable, amiable, gregarious, social, friendly.
For more than two years, the reclusive scientist's only contact with the outside world was the newspaper delivery boy.
Do not be so reclusive; try to get out more.
After endless torture from solicitors and the media, the millionaire decided to become a recluse