people of dubious background (/questionable antecedents) ? 有我們這樣老無知，老禽獸，不守本分，慣一招引～，上門吵鬧。(《古今小說》卷三十九) There are people like us who are old fools,old beasts,who do not know our places but always induce people of dubious background to come here to kick up rows.