shrewd

the word 'shrewd' originates from the middle english term for 'cursed' or 'wicked', derived from the concept of being afflicted by a shrew—a creature long associated in folklore with a malicious and spiteful nature. this literal sense of being 'evil-disposed' or 'dangerous' gradually softened and metaphorically shifted to describe a person whose sharp, piercing intelligence could be perceived as biting or severe. by the 16th century, the negative connotation receded, leaving the core meaning of keen, penetrating discernment, much like the proverbial sharpness of the animal's bite was abstracted into mental acuity. thus, a word once describing a curse or ill-temper evolved to signify astute and perceptive judgment.

this word is a simplex. it is a loanword from middle english shrewed, the past participle of the now-obsolete verb shrewen meaning 'to curse or scold'. the root 'shrew-' is from old english scrēawa, referring to a small, noisy, and supposedly malignant mammal.