Adjectives

(a)insularrelating to or characteristic of or situated on an island“insular territories”, “Hawaii's insular culture”
(s)insularsuggestive of the isolated life of an island“an exceedingly insular man; so deeply private as to seem inaccessible to the scrutiny of a novelist” (Leonard Michaels)
(s)insular, parochialnarrowly restricted in outlook or scope“little sympathy with parochial mentality”, “insular attitudes toward foreigners”