In a clannish manner; with strong loyalty to one's own clan or group while being exclusive toward outsiders.
From 'clannish' + '-ly' (adverb suffix), converting the adjective into an adverb that describes how someone acts or behaves in a clannish way.
Notice how adding '-ly' transforms judgments into actions—'clannish' describes people, but 'clannishly' describes their behavior! This distinction lets us separate the trait from the actions, an important linguistic feature for precision in criticism.
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