insular
IN-suh-leradjMeaning narrow in outlook; cut off from outside ideas
Memory hook INSUL = ISLAND: cut off from the world. Grandpa Gus lives on his own little island and waves away every boat bringing news and new ideas: “No thanks!” His outlook is insular.
The insular little town rarely welcomed visitors.
In context The club had grown insular; its members talked only to one another, ignored new ideas and hardly noticed when the rest of the school stopped coming.
Similar narrow-minded, inward-looking, isolated, parochial
Opposite open-minded, cosmopolitan, broad-minded
From Latin insularis, from insula (island).