Insular

1. adjective

   suggestive of the isolated life of an island; - Leonard Michaels

   “an exceedingly insular man; so deeply private as to seem inaccessible to the scrutiny of a novelist”

2. adjective

   relating to or characteristic of or situated on an island

   “insular territories”

3. adjective

   narrowly restricted in outlook or scope

   “little sympathy with parochial mentality”

   Similar: parochial