bǎi​nián​bù​yù

extremely rare

Senses

百年不遇 bǎi​nián​bù​yù (also bǎi​nián​bú​yù) extremely rare

once in a hundred years; very rare to happen or encounter, like a major flood or a once-in-a-lifetime opportunity

References

synonym 百年不遇/百年不遇 千载难逢/千載難逢
antonym 百年不遇/百年不遇 屡见不鲜/屢見不鮮
antonym 屡见不鲜/屢見不鮮 百年不遇/百年不遇
see 千载难逢/千載難逢 百年不遇/百年不遇