不三不四

不三不四	bù sān bù sì	(idiom) dubious; shady; neither one thing nor the other; neither fish nor fowl; nondescript
不	bù	no; not so / (bound form) not; un-
三	Sān	surname San
三	sān	three / 3
三不	sān bù	the three no's (abbreviated catchphrase)
不	bù	no; not so / (bound form) not; un-
四	sì	four / 4