Clannish \Clan"nish\, a. 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. -- {Clan"nish*ly}, adv. -- {clan"nish*ness}, n. [1913 Webster]
clannishness \clan"nish*ness\ n. 1. a tendency to associate with only a select group. Syn: cliquishness, exclusiveness. [WordNet 1.5] 2. a tendency to associate with only one's own clan; the propensity to display the sentiments, habits, and prejudices of one's own clan. [PJC]