shrewd

Good at making practical choices by noticing what is useful and what is likely to happen.

Usually admiring, shrewd suggests practical judgment and a clear understanding of people or situations. It can also hint that someone is calculating or carefully looking after their own interests.

• That was a shrewd move; you locked in the lower price before the offer ended.
• She's shrewd about hiring: she asks candidates what they learned from a mistake.
• He may seem generous, but he's shrewd enough to keep track of every favor.