behaviour that is friendly and helpful only to other people in your group, but not to people outside the group

There have been complaints about the clannishness and secretiveness of the Church. 有投诉指责该教派搞拉帮结派、遮遮掩掩的活动。

Clannishness can exist between different ethnic groups. 不同种族团体间会产生排外情绪。