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  1. having keen mental perception and understanding; discerning: to exhibit perspicacious judgment.
  2. Archaic. having keen vision.
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Origin of perspicacious

First recorded in 1610–20; perspicaci(ty) + -ous
Related formsper·spi·ca·cious·ly, adverbper·spi·ca·cious·ness, noun
Can be confusedperspicacious perspicuous

Synonyms for perspicacious

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Antonyms for perspicacious

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for perspicaciousness


  1. acutely perceptive or discerning
  2. archaic having keen eyesight
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Derived Formsperspicaciously, adverbperspicacity (ˌpɜːspɪˈkæsɪtɪ) or perspicaciousness, noun

Word Origin for perspicacious

C17: from Latin perspicax, from perspicere to look at closely; see perspective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for perspicaciousness



1630s, formed as an adjective to perspicacity, from Latin perspicax "sharp-sighted, having the power of seeing through; acute" (see perspicacity). Related: Perspicaciously; perspicaciousness.

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Online Etymology Dictionary, © 2010 Douglas Harper