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1. having or showing sharp powers of judgment; astute:

〈人が〉判断が正確な, 賢い; (世事に)抜け目のない; 〈考え方などが〉的確な

e.g. she was shrewd enough to guess the motive behind his gesture

e.g. a shrewd career move.

2. archaic (especially of weather) piercingly cold:

e.g. a shrewd east wind.

(of a blow) severe:

e.g. a bayonet's shrewd thrust.

mischievous; malicious.

Middle English (in the sense ‘evil in nature or character’): from shrew in the sense ‘evil person or thing’, or as the past participle of obsolete shrew ‘to curse’. The word developed the sense ‘cunning’, and gradually gained a favorable connotation during the 17th century.