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1. Of, relating to, or characteristic of a clan.
2. Inclined to cling together as a group and exclude outsiders.

clan′nish·ly adv.
clan′nish·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.clannishness - tendency to associate with only a select group
snobbery, snobbishness, snobbism - the trait of condescending to those of lower social status
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
Then it was that that clannishness, which was his to so extraordinary a degree, asserted itself.
Irish they claim to be, speaking of the North of Ireland with pride and sneering at their Scottish brothers; yet Scotch they undoubtedly are, transplanted Scotch of long ago, it is true, but none the less Scotch, with a thousand traits, to say nothing of their tricks of speech and woolly utterance, which nothing less than their Scotch clannishness could have preserved to this late day.
"Father Nye's parishioners, perhaps with village clannishness, looked upon him as a harmless political eccentric.
Obasanjo had decried that nepotic deployment bordering on clannishness and inability to bring discipline to bear on errant members , had grave consequences on the performance of the Buhari government to the detriment of the nation.
But the best novels defy the narrow clannishness of genre labels and Black one of them.
(33) Gillies may perhaps slightly overstate the case, but his point does reveal a certain truth, as community, neighbourliness, clannishness, closeness, friendship and kinship are all implications or extensions of the notion of hospitality in Scotland.
I find it highly disrespectful." The term "come from away" has indeed attracted a fair amount controversy in the region, where--along with the phrase "Who's your father?" --it became shorthand to reflect the "clannishness" of Atlantic Canada, and Nova Scotians in particular, with one somewhat short-sighted, though presumably well-intentioned local politician actually suggesting "banning" the term from local vocabulary.
It is that the Jews, because of their experience with persecution in the past, have acquired, over the centuries, a feeling of closely-knit clannishness in the face of possible further persecution which has made them very susceptible to the wiles of the demagogues who want to capitalize on that fear.
There is none of the clannishness found among other nationalities who harbor streaks of xenophobia.
There are ways in which Donald Trump is a kind of Dorian Gray's portrait of JFK with the same appetitiveness and clannishness (swap Ivanka for RFK) and personal secrets (tax returns for Trump, medical records for Kennedy), but without the youthful looks and eloquence and a patina of intellectualism and idealism to clean those failings up.
The notion of "dual loyalty" thus involves the notions of clannishness and cosmopolitanism.
The extreme clannishness, not to say xenophobia, of the Econ makes life among them difficult and perhaps even dangerous for the outsider (Leijonhufvud 1973:327).