insular

His formal announcement, held within the cozy confines of Mar-a-Lago, made his campaign feel insular and ill-suited to the current political realities.

They had encountered an age-old phenomenon common in insular communities cut off from home.

Strikingly, the insular cortex, a part of the brain that connects deeper brain regions with the cortex, had consistent and unique patterns for both positive and negative emotions, but not for mixed ones.

Immigrant culture can be very insular and fearful of outsiders, and there’s a good reason for that.

“The more insular you become, when you already don't have a majority, then you're going to reduce the appeal to people who would wish to remain in the Union.”