Meanings
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1
adj
socially exclusive and strongly attached to one's own close group
The organization had a clannish culture that made newcomers feel unwelcome.
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2
adj
characteristic of a clan, especially in showing strong internal loyalty
Their clannish loyalty kept the extended family united through the dispute.
Thesaurus
Etymology
Formed from clan + -ish. The neutral sense 'characteristic of a clan' developed a frequently critical social sense for groups whose intense internal loyalty excludes outsiders.