3 adjectives to describe shrewd

That then is a delightful kind of oratory, free, fluent, shrewd in its sentiments, sweet sounding in its periods, which is found in that demonstrative kind of speaking which we have mentioned.

Are they really so affectionate, or are they also a little shrewd in licking the hand that feeds them?

A little boy attended us through the first part of our progress, but soon appeared the veritable gardenera shrewd and sensible old man, who has been very many years on the place.

3 adjectives to describe  shrewd