HSK 7-9
不肖
búxiào形
(literary) unlike one's parents; degenerate; unworthy
老人痛斥那个不肖子孙。
Lǎo rén tòng chì nà ge bú xiào zǐ sūn.
The elderly man harshly condemned that unworthy descendant.
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Appears across levels (7-9) in the HSK 3.0 word list.