noun
insular mentality; island nation mindset
Refers to a narrow-minded, inward-looking attitude often attributed to people from island nations, especially Japan. Can carry a critical or self-reflective tone.
彼の考え方は島国根性が抜けていない。
His way of thinking still hasn't shaken off that insular mentality.
グローバル化が進む中、
As globalization advances, we need to overcome our insular mindset.