不易 (bù yì) means “not easy to do sth; difficult; unchanging”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
这个任务很不易完成。
Zhège rènwù hěn búyì wánchéng.
This task is not easy to complete.
Updated: 2026-07-18