sān bù
the three no's (abbreviated catchphrase)
sān bù zhī
to know nothing about the beginning, the middle or the end
to know nothing at all
yī wèn sān bù zhī
lit. to reply "don't know" whatever the question (idiom)
fig. absolutely no idea of what's going on
complete ignorance
bù sān bù sì
dubious
shady
neither one thing nor the other
neither fish nor fowl
nondescript
zháo sān bù zháo liǎng
scatter-brained
thoughtless
sān bù wǔ shí
(Tw) from time to time
frequently
sān bù guǎn
of undetermined status
unregulated