不折不扣用英语怎么说

100 percent

purely and simply
one hundred percent
to the letter

好多呢

我的老板真是是个不折不扣的吝啬鬼！
My boss is really a stinge!

她的儿子是个不折不扣的小淘气。
Her son is a right little horror

他是个不折不扣的流氓。
He is a regular rogue

他是个不折不扣的守财奴。
He's a real scrooge

absolutely, precisely, accurately, definitely, for sure, just so, literally, no ifs and/or buts, no mistake, on the button, on the money, specifically, squarely, strictly, the ticket, the very thing, to a tee.

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hardcore
indisputable
die-hard