Etymology
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perspicacious (adj.)

"sharp-sighted," also "of acute mental discernment," 1630s, formed as an adjective to perspicacity, from Latin perspicax "sharp-sighted, having the power of seeing through; acute," from perspicere "look through, look closely at," from per "through" (from PIE root *per- (1) "forward," hence "through") + specere "look at" (from PIE root *spek- "to observe"). Related: Perspicaciously; perspicaciousness.

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Definitions of perspicacious

perspicacious (adj.)
acutely insightful and wise;
much too perspicacious to be taken in by such a spurious argument
Synonyms: sagacious / sapient
perspicacious (adj.)
mentally acute or penetratingly discerning;
much too perspicacious to be taken in by so spurious an argument
Synonyms: clear-eyed / clear-sighted
From wordnet.princeton.edu