Shrewd

Shrewd (adj.)

• having sharp power of judgement
• astute (觀人於微)
• [“Shrew” means a bad-tempered woman]
• Origin ME (in the sense ‘evil in nature or character’): from shrew in the sense ‘evil person or thing’, or as the past part. of obs. shrew ‘to curse’.

Their money is now my money because I was so shrewd