1. 拉帮结派的;小集团的;排外的
If you describe a group of people as clannish, you mean that they often spend time together and may seem unfriendly to other people who are not in the group.

1. befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior

Synonym: cliquishclubbysnobbishsnobby

2. characteristic of a clan especially in being unified

e.g. clannish loyalty