conspicuously or grossly unconventional or unusual
"restaurants of bizarre design--one like a hat, another like a rabbit"
"famed for his eccentric spelling"
"a freakish combination of styles"
"his off-the-wall antics"
"the outlandish clothes of teenagers"
"outre and affected stage antics"
strangely unconventional in style or appearance.
"The artist's bizarre outfit, featuring a dress made entirely of ticking clocks, turned every head at the gala."
In plain English: Bizarre means something that is so strange and unusual it seems almost impossible to believe.
"The strange creature wandering through the park was truly bizarre."
Usage: Use bizarre to describe something that is strikingly unusual, often with an element of the strange or absurd. It typically refers to appearances, behaviors, or events rather than abstract concepts like ideas or theories.
The word "bizarre" entered English from French, where it originally meant "headlong" or "angry." Its ultimate origin is uncertain but may come from Basque for "beard," suggesting that bearded Spanish soldiers made a strange impression on the French, before the meaning shifted to describe something odd or peculiar.