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Definition of perspicacious : 1. Fig.: Of acute discernment; keen.
2. Having the power of seeing clearly; quick- sighted; sharp of sight.

Synonyms:

shrewd, perceptive, clear-eyed, cunning, alert, slick, sapient, keen, crafty, study at shrewd, savvy, penetrating, subtile, acute, penetrative, ability, clear-sighted, cagey, judicious, subtle

Epicurean, picky, demanding, delicate, particular, careful, fussy, diligent, flawless, methodical, rigorous, precise, prudish, discriminating, finicky, exacting, punctilious, discerning, scrupulous, proper, persnickety, squeamish, dainty, critical, correct, priggish, mincing, conscientious, severe, fastidious, accurate, prim, hypercritical, meticulous, literal, qualmish, choosy

comprehending, profound, intelligent, erudite, astute, knowing, gifted, encyclopedic, capable, canny, sophisticated, sharp, knowledgeable, worldly, bright, clever, genius, cogent, sagacious, wise, smart, brilliant, brainy, intellectual

Usage examples:

• God alone knew the treasure I was reserving for the man noble enough, and trusting enough, and perspicacious enough to come- having faith in my letters, having penetrated step by step into the depths of my heart- to come to our first meeting with the simplicity of a child: for that was what I dreamed to be the innocence of a man of genius. - "Modeste Mignon", Honore de Balzac.
• Her subconsciousness had probably been more perspicacious, and it is from that Phinuit had probably drawn the detail; at least unless he has the power of seeing certain things through opaque bodies. - "Mrs. Piper & the Society for Psychical Research", Michael Sage.
• His father, that old fox of commerce, so shrewd, so perspicacious, ended by divining the secret thought of his son; consequently, all his manoeuvres were now based on the natural expectancy to which Christophe had yielded himself. - "Catherine de' Medici", Honore de Balzac.