the GNU version of the Collaborative International Dictionary of English
adj. Of or pertaining to a clan; closely united, like a clan; disposed to associate only with one's clan or clique; actuated by the traditions, prejudices, habits, etc., of a clan.
The Century Dictionary and Cyclopedia
Pertaining to a clan; closely united, like a clan; disposed to adhere closely, as the members of a clan.
Imbued with the prejudices, feelings, sentiments, etc., peculiar to clans; somewhat narrow or restricted in range of social interest and feeling.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. characteristic of a clan especially in being unified
adj. befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior
Word Usage
"Italians were thought to be violent criminals; the Hungarians, Russians, Poles, and various others in the late 19 th and early 20th centuries were characterized as clannish, speaking their own languages, and being a threat to "American civilization"."