shrewdie

/ˈʃruːdi/
noun
  1. A clever person who is good at getting what they want, often in a tricky or slightly dishonest way.
    • That old shrewdie managed to talk the seller down to half the asking price.
    • Don't try to outsmart him—he's a real shrewdie when it comes to negotiations.
    • The kids called her a shrewdie because she always found a way to trade her snacks for better ones.
Synonyms
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