adjective
insular
IN-suh-ler/ˈɪnsələr/
Of an island separated from the surrounding world.
The insular settlement is surrounded by open sea.

Etymology
An island supplies the image of being cut off from other people. “Belonging to an island” became a description of outlooks narrowed by isolation and limited contact with others.
In context
my insular New England view of the immigration debate and what was it and to experience firsthand what it was like on other borders
More examples
- The biologist compares insular habitats with those on the mainland.
- The researchers study insular wildlife on the remote island.
- Trade brings new influences to the once insular village.
Forms
insular
insularity noun — Isolation from outside contact or influence.
Similar words
- isolated
- Emphasizes separation or lack of contact, not necessarily narrow-mindedness.
- provincial
- Emphasizes a narrow local outlook rather than island geography.