Bohemian

Concise Oxford English Dictionary © 2008 Oxford University Press:
Bohemian/bəʊˈhiːmɪən/

▶noun

• 1 a native or inhabitant of Bohemia, a region of the Czech Republic.

• 2 (also bohemian) a socially unconventional person, especially an artist or writer. [C19: from Fr. bohémien ‘gypsy’ (because gypsies were thought to come from Bohemia).]

▶adjective

• 1 relating to Bohemia or its people.

• 2 (also bohemian) socially unconventional.

– derivatives
Bohemianism noun.