low-down
adjective [ before noun ] informal uk/ˈləʊ.daʊn/ us/ˈloʊ.daʊn/
（人或行为）不诚实的，投机取巧的;不公平的
used to describe a person or action that is very dishonest and unfair
That was a low-down thing to do. 那样做不地道。
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