Simple Definition of clannish
: not showing interest in people who are not part of your group or who are not similar to you
Full Definition of clannish
1 : of or relating to a clan <clannish traditions>
2 : tending to associate only with a select group of similar background or status <a clannish community>
Examples of clannish
The college faculty can be pretty clannish, so it's difficult to be an outsider there.
<a clannish family that can be rather cool to outsiders>
First Known Use of clannish
Seen and Heard
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