不三不四

不三不四 [bù sān bú sì]

1. ■ （不像样子） neither fish， flesh nor fowl; neither one thing nor the other; (These men) are not this and not that.

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常用词组

1. ■ （不正派） suspicious (characters); dubious; shady; with no character; nondescript:

他常常和一些不三不四的人鬼混。 He often hangs around with some dubious characters.