insular; closed; exclusive; unsociable
Describes a group, organization, or person that is closed off to outsiders, resistant to new ideas, or unapproachable. Often carries a negative connotation.
Antonyms: 開放的
That company is insular and doesn't accept new ideas.
He has an unsociable personality and has trouble making friends.
open; openhearted; frank; liberal · open; spacious
From 閉鎖 (へいさ, 'closure, shutdown') + 的 (てき, '-like, -ish'), forming an adjectival noun meaning 'closed in nature'.