shrewd

Willie is very aware of this fact and lets Johnny Attell know that there is a fly in the ointment, and Johnny, who is a very shrewd article, has his chauffeur drive him to Bradford Street so he can change the kid's mind.

The most persistent tormentor was Alex Oxlade-Chamberlain, who scored a hat-trick in last month’s corresponding fixture in Iceland. His ability to run at defences is instantly striking, but it is his clever use of possession that has persuaded some shrewd judges that he is an even better prospect than Theo Walcott.

a shrewd guess

a shrewd blow, or assault

a shrewd wind

Portia:

There are some shrewd contents in yon same paper,

That steals the colours from Bassanio's cheek:

Some dear friend dead; else nothing in the world

Could turn so much the constitution

Of any constant man. What, worse and worse!— […]

Leonato: By my troth, niece, thou wilt never get thee a husband, if thou be so shrewd of thy tongue.