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“不三不四”，汉语成语，意思是不像这也不像那（neither one thing nor the other）。即不像样子，不伦不类。形容不正派或不像样子。可以翻译为“dubious/shady/ unsavoury(characters)”。
例句：
她的朋友尽是些不三不四的人。
Her friends are all pretty unsavoury characters.
有些不三不四的人在酒吧周围游荡。
There were some really dubious characters hanging around the bar.
Editor: Jade
