不三不四
bù sān bù sì
shady; disreputable
Character by character
不bù
not
not
三sān
three
three
不bù
not
not
四sì
four
four
Example
别跟那些不三不四的人来往。
Stay away from those shady types.
Tone: negative (criticism).
Usage and origin
A classic parental warning, also used of improper talk or clothes.
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