cliquish

基本解释

Cliquish, judgmental, and/or stuck up people annoy the hell out of me.
搞小集团的、主观的或傲慢的人会惹恼我。
The real worry is over Mr Orban’s headstrong ways and cliquish habits.
真正需要担心的是奥班先生刚愎自用，结党营私的习性。
Pigs can also be cliquish: an older new arrival may not easily find acceptance.
猪也可以自成一个小集体：一个新来的可能不被接受。

It is well known that boards of directors form a rather cliquish corporate elite.
FORBES: Boards and fraud - who gets the sack and who gets to stay?
The twenties, possibly alone among the middle decades of life, are passionately celebrated in fiction and memoirs, and the celebrations tend to share a style that is personal, specific, cliquish, pastiched, breathless, often bibulous, and flagrantly confessional—the voice of early mastery without mature constraint, self-discovery at a moment when each revelation seems unique.
NEWYORKER: Semi-Charmed Life

If you describe a group of people or their behaviour as cliquish, you mean they spend their time only with other members of the group and seem unfriendly towards people who are not in the group.