HSK 4
不必
búbì副
need not; does not have to; not necessarily
这点小事你不必担心。
Zhè diǎn xiǎo shì nǐ bú bì dān xīn.
You need not worry about this small matter.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.