Definitions from Wiktionary (shrewd)

▸ adjective:  Showing clever resourcefulness in practical matters.
▸ adjective:  Artful, tricky or cunning.
▸ adjective:  (informal) streetwise, street-smart.
▸ adjective:  Knowledgeable, intelligent, keen.
▸ adjective:  Nigh accurate.
▸ adjective:  Severe, intense, hard.
▸ adjective:  Sharp, snithy, piercing.
▸ adjective:  (archaic) Bad, evil, threatening.
▸ adjective:  (obsolete) Portending, boding.
▸ adjective:  (archaic) Noxious, scatheful, mischievous.
▸ adjective:  (obsolete) Abusive, shrewish.
▸ adjective:  (archaic) Scolding, satirical, sharp.

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