The quality or state of being strikingly odd, strange, or unusual in appearance or behavior.
From bizarre (from Spanish/Portuguese bizarro meaning 'gallant' or 'brave,' later meaning 'strange') plus the English suffix '-ness' which converts adjectives to nouns expressing a quality or condition.
The word 'bizarre' originally meant something bold or daring, then shifted to mean strange—this happens in language when bold or daring things seem weird to people!
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