/ ˈɪnsjələ(r); NAmE ˈɪnsələr/ adjective
1.
( disapproving ) only interested in your own country, ideas, etc. and not in those from outside :
The British are often accused of being insular.
2.
( technical ) connected with an island or islands :
the coastal and insular areas
► in·su·lar·ity / ˌɪnsjuˈlærəti; NAmE -səˈl-/ noun [ U ]
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WORD ORIGIN
mid 16th cent. (as a noun denoting an islander): from late Latin insularis , from insula island.