Traditional: 緣故
缘故 (yuán gù) means “reason; cause”. It is an HSK 6 Chinese word (traditional 緣故) in the HSK 3.0 vocabulary.
不知什么缘故他没有来。
Bù zhī shénme yuángù tā méiyǒu lái.
For some unknown reason he didn't come.
Updated: 2026-05-27