insular

in|su|lar /'ɪnsjʊlər, AM -sə-/
[ADJ]
If you say that someone is insular, you are being critical of them because they are unwilling to meet new people or to consider new ideas.
...the old image of the insular, xenophobic Brit.
insularity [N-UNCOUNT]
But at least they have started to break out of their old insularity.

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