SHREWD, adjective

1. Having the qualities of a shrew; vexatious; troublesome; mischievous. Obs.

2. Sly; cunning; arch; subtil; artful; astute; as a shrewd man.

3. Sagacious; of nice discernment; as a shrewd observer of men.

4. Proceeding from cunning or sagacity, or containing it; as a shrewd saying; a shrewd conjecture.

5. Painful; vexatious; troublesome.

Every of this number

That have endured shrewd nights and days with us. Obs. Shak.

No enemy is so despicable but he may do one a shrewd turn. Obs.

L'Estrange.