recluse
Concise Oxford English Dictionary © 2008 Oxford University Press:
recluse /rɪˈkluːs/
▶noun a person who avoids others and lives a solitary life.
– derivatives
reclusion noun,
reclusive adjective,
reclusiveness noun.
reclusion noun,
reclusive adjective,
reclusiveness noun.
– origin ME: from OFr. reclus, past part. of reclure, from L. recludere ‘enclose’, from re- ‘again’ + claudere ‘to shut’.
'recluse' also found in these Oxford entries:

