不必 (bù bì) means “need not; does not have to; not necessarily”. It is an HSK 3 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
你不必担心这件事。
Nǐ bùbì dānxīn zhè jiàn shì.
You don't need to worry about this matter.
Updated: 2026-05-27