Insular

From Conservapedia - Reading time: 1 min

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Insular, literally "of or pertaining to an island", is a term usually used to describe the mindset of one who does not know and does not wish to know of or give credit to matters outside one's existing experience (i.e. metaphorically one's island). An example would be a person or persons who do not wish to know of matters outside their own country, religion or political viewpoint.

See Willful ignorance.