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Synonyms for Bohemian (same or very similar meaning)

WordNet sense 1 (a member of a people with dark skin and hair who speak Romany and who traditionally live by seasonal work and fortunetelling; they are believed to have originated in northern India but now are living on all continents (but mostly in Europe, North Africa, and North America)):
gypsy, Gipsy, Roma, Romani, Romany, Rommany

WordNet sense 2 (not conforming to accepted rules or standards):

From the ODE community, based on WordNetadd/edit