perspicacious

[pur-spi-key-shuhs]
adjective
1.
having keen mental perception and understanding; discerning: to exhibit perspicacious judgment.
2.
Archaic. having keen vision.

Origin:
1610–20; perspicaci(ty) + -ous

perspicaciously, adverb
perspicaciousness, noun

perspicacious, perspicuous.


1. perceptive, acute, shrewd, penetrating.


1. dull, stupid.
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World English Dictionary
perspicacious (ˌpɜːspɪˈkeɪʃəs)
 
adj
1.  acutely perceptive or discerning
2.  archaic having keen eyesight
 
[C17: from Latin perspicax, from perspicere to look at closely; see perspective]
 
perspi'caciously
 
adv
 
perspicacity
 
n
 
perspi'caciousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

perspicacious
mid-17c., from L. perspicax "having the power of seeing through" (see perspicacity).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No wonder this perspicacious Justice accounts for seven of the thirty-eight
  selections.
Doug, that was both a perspicacious and hilarious comment.
And we'd like to thank you, Scott, for being such an astute reader and
  perspicacious student of the environment.
He was perspicacious and honest enough to acknowledge to himself the danger of
  such a stand.
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