perspicacious

形容词 perspicacious:

1. acutely insightful and wise
   同义词：sagacious, sapient
2. mentally acute or penetratingly discerning
   同义词：clear-eyed, clear-sighted

1. It is very perspicacious of you to find the cause of the trouble so quickly.
   你真是明察秋毫，问题的原因这麽快就找出来了。

per.spi.ca.cious

adj.（形容词）
Having or showing penetrating mental discernment; clear-sighted.See Synonyms at shrewd
敏锐的，聪颖的：具有或表现出看透人心理的洞察力的；眼光锐利的参见 shrewd

来源：
From Latin perspic3x perspic3c-
源自 拉丁语 perspic3x perspic3c-
from perspicere [to look through] * see perspective
源自 perspicere [看穿，看透] *参见 perspective

【引伸】
per.spica.ciously
adv.（副词）
per.spica.ciousness
n.（名词）