in ‧ su ‧ lar /ˈɪnsjələ, ˈɪnsjʊlə $ ˈɪnsələr, ˈɪnʃə-/ BrE AmE adjective
[ Date: 1500-1600 ; Language: Late Latin ; Origin: insularis , from Latin insula 'island' ]
1 . interested in your own group, country, way of life etc and no others – used to show disapproval ⇨ parochial :
an insular community
the insular world of the law
2 . formal relating to or like an island
—insularity /ˌɪnsjəˈlærəti, ˌɪnsjʊˈlærəti $ -sə-, -ʃə-/ noun [uncountable]