insular; closed; unsociable; exclusive
open (attitude, etc.); openhearted; frank; liberal
この村の社会は閉鎖的だ。
The society in this village is insular.
閉鎖的な雰囲気が新入生を遠ざけた。
The exclusive atmosphere kept new students at a distance.
閉鎖的にならず外部の意見を取り入れよう。
Let's not become insular and take in outside opinions.