What is the meaning of Shrewd?

Showing clever resourcefulness in practical matters.

Artful, tricky or cunning.

streetwise, street-smart.

Knowledgeable, intelligent, keen.

Nigh accurate.

Severe, intense, hard.

Sharp, snithy, piercing.

Bad, evil, threatening.

Portending, boding.

Noxious, scatheful, mischievous.

Abusive, shrewish.

Scolding, satirical, sharp.

Source: wiktionary.org