In a strange, unusual, or surprising way that doesn't fit normal expectations.
From French 'bizarre' meaning 'odd,' which came from Spanish 'bizarro' (originally meaning 'brave' or 'handsome'). The meaning shifted over time, and 'bizarre' entered English in the 17th century meaning 'strange.'
It's wild that 'bizarre' originally meant 'brave and handsome' in Spanish—something brave and bold can look strange to people who don't understand it, so the meaning shifted! Language constantly changes as words travel between cultures.
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